Why OneDrive created a duplicate set of folders?

For some unknown reason (to me), a set of duplicate folders were created in one of my main folders. They have the same names as my original set, but then they are followed by "-[computer name] Mac". I've been using OneDrive for years (starting with SkyDrive when it was first introduced), and I have never encountered this. I've tried searching for answers but I don't know that I'm looking for the right thing. I'm fairly new to the Mac world, so this has completely thrown me for a loop. I'm not sure if it's a OneDrive thing or a Mac thing. Can anyone help? TIA