iCloud photo library - Lost locations
I think this one has to do with your iCloud account. 
First of all you need to be up to date to all of your Apple devices under the same appleid (your appleid). Then my suggestion is to log out of your iCloud account to all of your devices and login back again. Also check Photos location services (that’s under settings/ privacy / location services/ photos) should be “ WHILE USING”.  Reboot your devices and see how it goes. Cheers.