Session images suddenly not visible anymore

Dear all,

For some weeks I face an annoying issue. Session images suddenly are not in the session folders (Capture Folder) anymore.

My process: I edit an image, save the image (output folder) switch to another application, switch back to Capture One and the edited image plus 20% of all images taken are gone. They still are on the drive available, but the color tags and star rating is a complete mess. Any suggestions on how to resolve this issue?

Regards

Robert