Sprite "Jumps" When animation changes on collision

Whenever my player sprite changes animation after colliding with a static enemy,the player and the whole screen "jumps" a few pixels upward, and I get this awkward flicker. The same thing happens when it changes back 2 seconds later. What gives?

Would really need to see your code, or a demo of it happening.

sounds like the origin of your animation frames are not aligned. But as ArcadEd says. An example would be great.

I came home to post the file up, but you were right, the origins were out of line. Thanks