Export Folder as Catalog automatically removes folders

Hi the Community,

I'm running Lightroom Classic V11.5 Camera Raw 14.5 on up to date Windows 10. Once a project finished, I used to export its folder as a catalog. I did it for years. Some days ago, while exporting this way catalogs I discovered that:
- Lightromm creates the folders, exports the catalog and the RAW files
- Once done all the created folders and files are automatically removed

I tried several times, watching in parallel in Windows Explorer: I can see creation in it and deletion.

One additional weird thing with catalog these days is that the weekly automatic backup does not remember that it was done. Closing Lightroom I accept the weekly backup, but on the following closings Lightroom prompts again for the weekly backup.

Does anyone experience these days such troubles with Lightroom Classic exporting or backuping catalogs?
     or did experience in the past?

Thanks a lot for your support/sharing.