I think there may be an issue with the software itself. I started having the same problem after my last two upgrades. It's not handling my images the way it should. I've created a few videos before with no issues, now when I move my image on the timeline even though they are grouped together under a parent image the eyes and the arms move away from the body along the timeline. I've been trying to fix this for hours. The second to last update I did automatically resized all my images in my videos as I opened them. I like what I can do with this software but it needs a lot of work.
Here is a sample video of what I was able to do, I just cannot move those images the way I would like, it would take too many key frames because of the issue I'm having. https://youtu.be/_8zLUxmMnNg