I don't know if I did something wrong, or if this is any issue.

I have a 600 frame timelapse. No camera movement or panning during the capture.

I had 3 keyframes, 1st frame, middle, last. Very little light changes during the capture.

I cropped the last frame in to a tighter view of the scene. The crop included coming in from the left, right, top and bottom, but it was straight. No rotation at all.

When I then saved the metadata from the keyframes and went back to LRTimeLapse to continue the process, after generating the visual previews, I did a quick check in LRTimeLapse to see what it would look like.

The scene rotated over the sequence to the last frame and was off by about 20 to 30 degrees when it completed.

Did I do something wrong in trying to animate the crop??

thx

Mac: 11.8.2 Big Sur
LightRoom: 11.2
LrTimeLapse: 6.0.0

This can happen, if you have different crop aspect ratios on the keyframes.
If you animate the crop, you should set the aspect ratio on the first keyframe then sync the crop to the othw keyframes and just modify the size.
There is a dedicated tutorial about animation the crop on the tutorials page / expert tips.