I had this issue as well. I was a passanger with someone and was playing around with it while they dove. I got home and the clips from the middle of our trip ended up in different folders, and then of course locked files are in their own folder.
I also have found out. I don't know if this is the case with the G1W, but on my Vico TF2 if i rename a clip from the standard naming that the camera sets and move it over to my PC,but forget to take it off the SD card in the camera my Vico will not erase it through the loop recording and it acts like a locked file in the standered folder