Problem with pixel art filter

Hey guys I’ve a problem a bit strange… I’ve a pixelated player, I apply the FILTER_NEAREST to rescale the player without smoothing, but sometime, the player is smoothing… o.O I don’t change anything though the filter seems don’t work.

could you post screenshots?

or some relevant nearby code to what you think might be the problem?

Could the filter be changed/reset at some point?

This is the code of the zombie.
http://pastebin.java-gaming.org/f78ee9d8a6a

And here a screenshoot.

http://img138.imageshack.us/img138/1306/77nx.png