[CLIENT] My mastery pages were temporarily replaced with someone else's.

I was browsing one of my friends rune pages. We were in queue and wasting time. When we got into champ select I tried changing my mastery page only to see most of my mastery pages were replaced with the mastery pages of the same person as the one with the rune pages we were looking at. When I tried clicking on one of his pages and message appeared that I can't remember exactly and I didn't get a screen shot of it, but it went something like this: [ERROR]: Unknown error has occurred, something about nothing can be done. The way I got out of this bug was to click on the only mastery page that was mine at the bottom and once I closed the drop down menu and reopened it were my mastery pages returned to normal. Have not tried duplicating the bug again, but you can check the pages in the screen shot with the ones on my profile and I promise that I have not changed them. Compare the ones seen with the ones on my friends pages: vry pwrful.

Here is the image!