Problem with scaling after replacing proxies with original files

Hi there!

I hope you can help me with a problem I’m facing in regards of a project I’m working on.

I received proxy-files of a project to edit them into a a split-screened video.
After finishing the edit, my co-worker tried to replace the proxy-files with the originals. In that process, all of the scalings for the individual video-files ended up being too large and going beyond the intended format.
I tried to visualize it for you in the attached image. We changed the size of the files for them to fit the format again but since I used some tracking shots and zooms, it would be a hassle to readjust those.
The sequence settings are also included in the attached image.

Hope someone can help me with this! Thank you!