I just found a bug in the champ select and didn't knew if it was already reported or not. I was banning champion and used the search text field to find my champion to ban. When I want to erase the name I double-click in the search field.
When I started double-clicking this area non-stop (cause I was bored of waiting for the other team to ban) the ban icons were switched / moved to other non banned champion. Other summoners in my game did the same and they also had this bug.
Sorry for my bad english but it is not my native language.
Hope this help and if it does, I want a cookie !