Default measure changes to mm after changing page size.

So, I'm working in centimeters all the time, but in the last few days Corel just grabbed a mind of his own and now everytime I change the page size it reverts to millimeters.

Deleted every custom page size I had, created them all again, always in centimeters. Saved settings, restarted Corel and still happens.

Rulers are in cm too. Not sure what else I can try, any suggestions?