Ghost position keyframes in After Effects I have an animation in After Effects where I am animating a slider to move up and down at certain points. The slider should be mainly stationary, but moves occasionally in line with other actions on the project.



What I am finding though, is the slider is moving a small amount even when the keyframes are set such that it should be static. E.g. the following two keyframes are the same (Y position = 524.6) but if I move the marker in between, you'll see the value deviates from this. (As a result the slider moves.)

1st Keyframe (Y Position = 524.6):


2nd Keyframe (Y Position = 524.6):


In between (Y position varies, up to 525.4):


This is driving me nuts! As far as I can see the anchor point does not move, so I don't understand why this should happen.
It's because of spatial interpolation.  Here's a previous answer:

Object moving to a position I didn&#39;t specify