Changing position on one keyframe, changes display position of next keyframe - and so on

Hi There,

No idea if this is a bug or a setting but I'm having a frustrating issue where changing the position for one keyframe, also changes the display position of the next keyframe (it doesn't change the position numbers).

And if I manually adjust each keyframe, the starting position becomes crazier and crazier until I get to a keyframe that I can't position at all.

Does anyone know how to fix?

Have tried/checked:

1. That both temporal and spatial interpolation are set to linear
2. Deleting all keyframes and starting again
3. Un-toggling animation for position and starting again
4. Un-toggling animation for scale and position, then starting again
5. Restarting premiere
6. Restarting Premiere, opening a different project, quitting and reopening the current project again

I have 28 frames where I need to match a mask that is on source footage I can't alter. The clip (a PSD date) also has an animated mask on it.

On the first clip, it took 20sec to adjust each keyframe manually. But on the second change-out (duplicate sequence, replace with clip from bin) it won't play ball.

Does anyone know if this is a bug or a setting somewhere?

Any help much appreciated.

Cheers, Ben