So I have a video overlay on the bottom left, it all looks correct in the sequence window and the export preview. however when I save it out the top layer is different. images below.
Correct preview: https://ibb.co/hh8jfQ
Exported MP4: https://ibb.co/n38vn5
It was exported with the correct res, and I'm using the professional latest version on mac. No video effects other than scale down and position. I don't understand why it would look different from the preview and sequence window, than on the final export.
UPDATE: When I'm on the export preview window, and I click to different times in the video, sometimes it's the correct size and sometimes it's not. This must be a bug? Bear in mind it's all one long video, not split in any places.