Sometimes when I log out, when I log back in I do not have as much money as previously. I may be losing things I've bought too, but I'm not sure about that.

One time after I had spent some bucks I lost the hat I had bought, but the bucks were refunded.

Basically I think it's rolling back and losing changes - doesn't always happen, and I'm not sure what triggers it, sorry.

Yeah, I too lost my money and my Cheese head 2 after logging out, even though I played several games before logging out, so I thought that would update my player status..
Edit: I bought 2 Homing Missiles and lost them and the creds too D:

its took stuff from me too, the purple stars, achievements, seems to not always remember the last bit, however it always errs against me, meaning if i spent money, its spent, but i dont get to keep the item i bought with it.... it sux...

I don't know if it's relevant, but I just experienced this bug again - I'm doing other things as well and got several "reconnecting to server" messages while not doing anything - this didn't have any effect.

However when i actually refreshed the page (to get rid of the 'you are here' artifacts in UI that others have reported) I lost exactly 500 coins. My XP was unaffected, and I still had all my inventory. I hadn;t done anything in the game for at least ten mins.