Someone elses mastery pages are now mine? (Visual Bug)

I played a match, and then I checked a recently played players mastery page. I started another match, and when I got into the match, all of the players masteries were now showing as my own. When I clicked one of the mastery pages, I got the error message in the picture I uploaded. Once I went in to edit one of the mastery pages, all of my mastery pages returned back to normal.