I've been having an issue with Premiere for months now (across multiple projects on multiple computers) where the program adds an invisible keyframe on the X-axis between two existing keyframes. I cannot delete this "keyframe" and I cannot add a keyframe in the middle of the unwanted change to re-center the clip (because the ghost keyframe will then shift to be in the middle of the previous keyframe and the newly-placed keyframe).
My only options are to delete all of my keyframes and try again on a new timeline (which doesn't always solve the problem. I'd say about 60% of the time, the ghost keyframe will just put itself back in), or I have to keyframe the placement of every single frame. Both of these options are spectacularly time-consuming and incredibly frustrating.
Video of Issue In the video, you'll see the actual problem, what the keyframe values are actually doing, and what happens when I try to add a keyframe where the ghost keyframe is (described above).