I am trying to understand may have happened.
In all screenshots, you are showing a repaired video, which means somewhere along the lines, you would have got a dialog box pop up asking you to fix the file. What is not clear is what happened to repair your project file. Was it missing files that you needed to relocate, or something else.
While you have
AI - Repaired.mlt, you should also have
Copy both of these files to a different folder or drive as a backup before proceeding.
What did Shotcut want you to repair with your
Can you upload both mlt files here? Just drag & drop into the reply window. We don’t need the source video/image/audio files.
It might just be as simple as going through the repair process again and finding missing files. If you have moved or deleted video/image files, just put them back where you may have moved/deleted them from, and attempt to reopen