Can't keyframe a linear animation. Linear animations have "velocity" or "curves"

[rv_el]

I have a large image overlay and I'm scaling it very large and then animating it scaling smaller. I only have 2 keyframes and they are set to linear but the animation "ramps". It is slower at the beginning and very fast at the end.

How can I keyframe animations inside Premiere Pro to just be linear and straight forward? I'm seeing this across my animations.   

Thanks

[Peru Bob]

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premi...
Then try pressing Enter to render the timeline and turn the red line above the timeline to green.