This has been happening to me a lot only in a recent new project I have been working in the last month or so, whenever I hit ‘Save All’. Sometimes when I would save it just kept asking me to save a new level over and over, the longest chain was like 20 new levels it asked me to save before it stopped. Sometimes it is 5 or 7 new levels. The only new thing I have been using in this project for the first time is datashith cad importer. It seems when I try to bring the Datasmith Scene asset(basically its just a group of all the meshes in the CAD file) into my level or into a sequencer, and then next time I save it does this. I have like 50 random saved levels, that I eventually widdle down and delete eventually once I know it is safe, but its really annoying.
Only way top fix it I have seen is save all the levels it asks, then restart the editor/proj, and now it will no longer do it. Until it pops up again a few days or hours later in the same project.