Gameplay Sejuani 414 MR with 2 MR items.

So I was playing a game and went from solo quadra kill to not being able to touch any of their team because a Sej built Gargoyle Stoneplate and Abysal Mask and somehow ended up with 414 MR while not around enemies. I calculated her base + runes + effects of items in the game and figured she could only have around 200 MR.

I'm reporting this because it's frustrating as hell to do your very very VERY best at something and get crapped on because in game bugs. No idea how this happened but this is not Rammus Approved. Ok?