Water in a bottle


I’ve made an animation with water in a bottle. The bottle moves up, turn upsidedown and returns to his starting point. At the moment of returning, the water in the bottle reacts really strange. Instead of the bottle being empty it fills again with water and the water leaks out of the bottle. Anyway here is a animation to see the problem:

(rightclick and save as… if it wont play)
Any idea’s? The resolution is set to 300, so tht would be big enough.

Thanx, Twan