Keep being asked to sign in

Hi Everyone.

I own two computers, one is a pc tablet in the art studio and the other is a desktop at home. Both are up to date with the Photography plan.

On the desktop pc I keep on being asked to sign in ( at least a few times a week ), not a problem in itself, slightly annoying though. The issue is CC asks me to log out of my desktop PC and log in to the same computer. CC thinks there are 3 PC's, two of which are the same PC - it appears there is a second instance of my desktop PC.

To sign in and use Photoshop I have to swap between the two to sign in.

Any ideas on how to fix this?

Any help would be appreciated.

All the best.

Chris