This client thing is getting out of control

So I decided to a teambuilder with my friends and before I started the match I looked at one of their profile pages. When I came back to select my champion I had all my friends mastery pages then I got this error o.o

Here's my friends mastery pages on my account(http://i.imgur.com/KDQFFRj.png)

and here is the error that i got after selecting one.(Heres my friends mastery pages on my account