I realize that as soon that you use the Rotation/Mirror Effect, when i Import a objet(exemple Present Arrow) to the picture or video, the objet resets to the original position and size, I tried with different image object like Text Thought Bubble, after you export in MP4 UltraHD Preset.
One more thing even I select Don’t play out after the export it still plays after the export.
I use Movie Edit Pro Plus 2020.
Here is the steps to recreate the problem.
1) Import a photo or video in the time line.
2) Go to Templates and Image Objets.
3) Import a objet(exemple Present Arrow) to the picture or video.
4) Go to Effects Size/Position and reduce the size of the Arrow.
5) Go to Effects Rotation/Mirror and rotate the Arrow in a angle.
6) Go to File/Export Movie/Video As Mpeg-4.
7) Choose the Preset [ MP4 UltraHD 3840x2160 29.97p ].
8) After the export you will see that the Arrow return in to it original position and size.