Adding to a vector that is empty in a linked list node

[catdance]

I'm writing a video store program and I've added the customer classes to it. Each customer node has a name, number of rentals, and a vector containing the titles of videos that they rented. It works fine if the vector already has something in it but if it is empty, it is pushing back the wrong title. I'm at a loss as to why this is happening. These files are linked to unorderedLinkList.h and linkedList.h which are provided by the author. Sorry that this is very long but I wanted to show you examples. Thanks for any help that you can give.

int main()
{
videoListType videoList;
CustomerListType customerList;
int choice;
char ch;
string title;
string cName;
// code that reads input - works fine
    displayMenu();
    cout << "Enter your choice: ";
    cin >> choice;    //get the request
    cin.get(ch);
    cout << endl;

        //process the requests
    while (choice != 9)
    {
        switch (choice)
        {
        case 1: 
            cout << "Enter the title: ";
            getline(cin, title);
            cout << endl;

            if (videoList.videoSearch(title))
                cout << "The store carries " << title 
                     << endl;
            else
                cout << "The store does not carry " 
                     << title << endl;
            break;

        case 2:            // This is for renting videos
            cout << "Enter the title: ";
            getline(cin, title);
            cout << endl;
			enterCustomer(cName);

            if (videoList.videoSearch(title))
            {
                if (videoList.isVideoAvailable(title))
                {
					if (customerList.isCustomer(cName))
					{
                    videoList.videoCheckOut(title);
					cout << "case 2 " << title << endl;
					customerList.videoRental(cName, title);
                    cout << "Enjoy your movie: " << title << endl;
					}
                }
                else
                    cout << "Currently " << title
                         << " is out of stock." << endl;
            }
            else
                cout << "The store does not carry " 
                     << title << endl;
            break;
// code for other cases
      }//end switch
}

#ifndef H_CUSTOMERTYPE
#define H_CUSTOMERTYPE

#include <iostream>
#include <string>
#include <vector>
using namespace std;

class CustomerType
{
public:

	CustomerType();
	void setCustomerType(string, int);
	void addVideo(string);
	string getName();
	int getNumRentals();
	vector<string> getVideosRented();
	void rentVideo(string);
	void returnVideo(string);
	void printCustomerInfo();
	bool checkCustomer(string);
    bool operator==(const CustomerType&) const;
    bool operator!=(const CustomerType&) const;
	

private:
	string name;
	int numRentals;
	vector<string>videosRented;
};
#endif

void CustomerType::rentVideo(string v)
{
	numRentals++;
	cout << "rentVideo numRentals " << v << " " << numRentals << endl;
	videosRented.push_back(v);
	if (numRentals > 0)
	{
		for (int i=0; i < numRentals; i++)
	        {
		  cout << "Video " << i+1 << " is " << videosRented[i] << endl;
		}
	}
	
}

#ifndef H_CUSTOMERLISTTYPE
#define H_CUSTOMERLISTTYPE


#include <string>
#include "unorderedLinkedList.h"
#include "customerType.h"

using namespace std;

class CustomerListType:public unorderedLinkedList<CustomerType> 
{ 
public:

 bool isCustomer(string) const;

 void videoRental(string, string) const;

  void videoReturn(string, string);

  void printCustomer(string) const;

  void printCustomerList();

 private:
    bool searchCustomerList(string n, bool& found,
                         nodeType<CustomerType>* &current) const;

};

#endif

bool CustomerListType::searchCustomerList(string n, bool& found,  
                         nodeType<CustomerType>* &current) const
{
    found = false;   //set found to false
   
    current = first; //set current to point to the first node
                     //in the list

    while (current != NULL && !found)     //search the list
        if (current->info.checkCustomer(n)) 
            found = true;
        else
            current = current->link; //advance current to 
                                     //the next node    
		return found;
}//end searchVideoList


bool CustomerListType::isCustomer(string n) const
{
    bool found;
    nodeType<CustomerType> *location;

    searchCustomerList(n, found, location);
    return found;
}

void CustomerListType::videoReturn(string n, string title)
{
	bool found = false;
    nodeType<CustomerType> *location;

    searchCustomerList(n, found, location); //search the list

	if (found)
		location->info.returnVideo(title);
	else
		cout << "Customer is not in the club.\n";
}


Customer text file which reads correctly:
John Smith
1
Titanic
Meg Ryan
0
Jane Doe
2
Sister Act
Rain Man


List of titles from another file (also reads correctly):
Video Title: Rain Man
Video Title: Jerry MacGuire
Video Title: Sister Act
Video Title: One Fine Day
Video Title: Titanic


Output of code (I do an example of a customer with a rental and the one without):
Select one of the following:
1: To check whether the store carries a particular video.
2: To check out a video.
3: To check in a video.
4: To check whether a particular video is in stock.
5: To print only the titles of all the videos.
6: To print a list of all the videos.
7: To print customer info.
8: To print a list of all the customers.
9: To exit
Enter your choice: 8

Customer name: Jane Doe
Number of rentals: 2
Video 1 is Titanic
Video 2 is Sister Act

Customer name: Meg Ryan
Number of rentals: 0

Customer name: John Smith
Number of rentals: 1
Video 1 is Titanic

Select one of the following:
1: To check whether the store carries a particular video.
2: To check out a video.
9: To exit
Enter your choice: 2

Enter the title: Sister Act

Enter customer name: Meg Ryan

check customer name Jane Doe n Meg Ryan
check customer name Meg Ryan n Meg Ryan
case 2 Sister Act
check customer name Jane Doe n Meg Ryan
check customer name Meg Ryan n Meg Ryan
in videoRental Sister Act
rentVideo numRentals Sister Act 1  /*this is in the CustomerType::rentVideo(string v) - v is correct */
Video 1 is Titanic          /* same function but videoRentals is showing wrong video */
Enjoy your movie: Sister Act // back at main

Select one of the following:
7: To print customer info.
8: To print a list of all the customers.
9: To exit
Enter your choice: 7

Enter customer name: Meg Ryan

check customer name Jane Doe n Meg Ryan
check customer name Meg Ryan n Meg Ryan
Customer name: Meg Ryan
Number of rentals: 1
Video 1 is Titanic

Select one of the following:
1: To check whether the store carries a particular video.
2: To check out a video.
9: To exit
Enter your choice: 2

Enter the title: Sister Act

Enter customer name: John Smith

check customer name Jane Doe n John Smith
check customer name Meg Ryan n John Smith
check customer name John Smith n John Smith
case 2 Sister Act
check customer name Jane Doe n John Smith
check customer name Meg Ryan n John Smith
check customer name John Smith n John Smith
in videoRental Sister Act
rentVideo numRentals Sister Act 2
Video 1 is Titanic
Video 2 is Sister Act        // here the video is correct
Enjoy your movie: Sister Act

Select one of the following:
7: To print customer info.
8: To print a list of all the customers.
9: To exit
Enter your choice: 7

Enter customer name: John Smith

check customer name Jane Doe n John Smith
check customer name Meg Ryan n John Smith
check customer name John Smith n John Smith
Customer name: John Smith
Number of rentals: 2
Video 1 is Titanic
Video 2 is Sister Act   

Select one of the following:
1: To check whether the store carries a particular video.
2: To check out a video.
3: To check in a video.
4: To check whether a particular video is in stock.
5: To print only the titles of all the videos.
6: To print a list of all the videos.
7: To print customer info.
8: To print a list of all the customers.
9: To exit
Enter your choice: 9

Press any key to continue . . .