15.073 - Keyframing not working correctly

I need to paint some ropes out of a shot. I'm using the power curve and keyframing it. The keyframing feature skips every other frame - i.e. the power curve only moves once for every two frames. Footage is pro res/4k from a Shogun Inferno, 4k RAW source (FS7). Frame rate is 23.976. Machine is Windows 10 pro, AMD Threadripper, NVidia 1080ti gpu, RAIDs, etc. with a Blackmagic minimonitor 4k.

I should add, that the clip in question was slowed to 50% using optical flow. I couldn't get it to look believable, so I pulled another clip that I didn't need to slow down. It would be nice if the keyframing saw the "new" frames.