USB Flash Drive Playback in car

This is for a 2016 Prius. On a USB Flash Drive, I have the mp3 files arranged into 3 folders called CarTalk, Oldies, Soundtracks.

When I play a file from CarTalk it plays normally and when turn off the car and restart it, the playing starts at the

first mp3 file instead of where it left off, also I notice there is a & character to the left of the first filename in this folder.

If I play a mp3 file from the other two folders the play continues from where I last turn off the car.

I checked an repeat mode is not enabled. Any ideas why in the CarTalk folder it does not continue where I was when the car was turned off?