Played a game on the new SR as Sona when the bug first appeared. At game start when I purchased items, a random message popped up that said " purchased !" instead of the normal "Sona purchased wards" message. All my teammates also saw it. About halfway through the game, another message popped up, saying something like "ItemRefundFalse". Couldn't get in game screenshot, but did a custom afterwards on the old SR and the bug happened again, so I took a screenshot of the messages.