Bezier curves even on linear?

Hello,
I am trying to get to layers to have identical motion but Premiere is automatically creating a bezier curve on one of my layers it the keyframes still say they are linear but the clip moves as if it is beziered. If I click on the motion effect I can see the motion that the clip is doing via the display monitor and manually drag the curve to fix it, but it is tedious and hard to get perfect.
I am using CC 2017

Thanks for any help.