When making changes to my rune page, it makes me leave champ select.

Anytime I make changes to my rune page during champ select, there are times when I'm sent back to the lobby because I supposedly left champ select. I'm always so confused because when I'm queued up with friends they ask why I dodged when I was just making my rune page. I have no clue what triggers it but I've noticed that it happens when I'm viewing my rune pages, and it really bothers me when it does happen because I'm penalized for it.