Re:Symbols moving erratically on motion tween

There must be slight value differences that got recorded when you used the IK from frame to frame… Can you look in the properties to see the values?
If the feet are supposed to be in a static position, did you nail down before using IK? What part of the body did you move? …maybe the feet follow?

I have a character crouching down in one spot - the feet are all in the same position from keyframe to keyframe but they move around throughout the motion tween. Do I have something set wrong? A little more info, the legs are set up as a hierarchy and I animated them using the IK tool.