Problem with track suddenly becoming stereo

Every now and then I have this problem but I’ve never asked or searched for a solution, now I finally did but couldn’t find anything…

The issue is that sometimes I have no idea why, when I open a project, one or two tracks will outta nowhere be set as stereo in and output, the volume will be back up to 0db, the pan will also be reset and all the inserts will be gone, even if I make a new mono track, copy the audio files to this new track, put the inserts all again and save, when I open it again, it will open again with the very same tracks suddenly in stereo, with volume, pan and inserts all reset…

Does anybody have any clue what’s that problem???