Champ Select Issue: Masteries/Rune pages Drop-down select menu error.

MAC OSX 10.9.5 League of Legends 6.2.16_01_25_20_50

If I view another player's profile prior to queueing into a ranked/normal game, the drop-down menu where all of my masteries and rune pages populate are automatically replaced by the masteries and rune pages of the users profile page I was previously on. Is anyone else experiencing this problem? An error message also appears.

It's extremely frustrating and it's happened prior to this new patch, and still occurs.