QuickTime videos playing sideways
I recently upgraded to an iMac with an M3 chip, running Sonoma 14.4.1. All my videos that were in portrait mode, are now sideways in landscape mode, when viewing with QuickTime player (10.5). If I go to edit to Rotate right, they rotate 180 degrees so they are still sideways. I can't get them to rotate only 90 degrees. These same videos play fine on my older Intel Mac computer which was running the same system. Any hints would be appreciated!
iMac (M3, 2023)