Beginner forums weird bumping

sometimes ill go into the beginner forums to loop at the latest problems and see if i can help in anyway, but sometimes topics that havnt had replies in months appear at the top? just today the full first page was topics all from marth 12th for some strange reason? Any reason for this?
I don't know, at the time of writing this, the first 3 pages of Beginner forum are updated. With the last post of page 3 being last updated at Apr 26, 2012 at 11:17pm.
There's a button for archived topics at the bottom of the page. Any chance you accidentally clicked that?

It's might be possible for single topics to be "ninja-bumped", since you can delete your own posts, depending on how the forum is set up.
i cant seem to find that button, but i am stuck in it still... any help?
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