deformer keyform moving in an arc instead of going straight.

[chilly stirrup]

I'm having an issue with the parameters, lets say I rotate a deformer on a keyform. the deformer will move slightly down and look like its bouncing before getting to the keyform instead of just rotating normally or moving normally, like theres a weird arc or something.

heres an example, see how the backhair isnt gradually going up but starts going up right before reaching the end of the parameter? im not sure whats going on