BUG: Surrender Broken

Just finished playing a game on summoner's rift where the enemy team agreed to a surrender with 4 votes, but the game didn't end. It just kept going, and when they finally got another chance to surrender, it passed again with 5 votes and actually ended the game. I've never seen a game fail to end with a decisive majority vote to surrender, and I have no idea what caused it to happen.

i was playing a gangplank mirror match top though, so maybe that has something to do with it.