No problem, glad to help. I should emphasize the issue only occurs when rotating the object with the Gizmo, not when rotating through the transform dropdown on the left in Object Details.
I've uploaded another video which I hope very clearly shows how I am able to produce the issue in case there is still any uncertainty. As mentioned the issue only begins on specific axis rotations - in this video example the issue appears to begin once I rotate the resized models on their red X axis. If you compare the position I rotated the object to with the Gizmo, and then the resulting position once I return to that keyframe, it is not the same.
As mentioned previously this issue did not occur for me on the previous version of the program (but it had the bigger issue of undo/redo messing with the rotation so I can't go back lol)
Thanks for your awesome work on this app btw, it's really something special!