The most likely cause for an AP lost like yours is some of your comments getting deleted. Spammy game comments are constantly being deleted so if some of your comments weren't very helpful then they could have been erased. Another possibility is that an user has deleted comments that you left in their profile causing you to lose the AP that you had earned because of those. For more information on the game comments cleanup go to [url=http://armorgames.com/community/thread/6749389/are-you-missing-armor-points-lately]Are you missing Armor Points lately?[url/]
He lost points the same way everyone else loses points. Which, incidentally, is why there is a sticky, in plain sight, called "Are you missing Armor Points lately".
I hate it when nobody reads the stickies. They're so helpful. There's all these tips on how to stop the ants from getting to your points. (ahhh, how i love the smell of C4)