(Small Bug) Over 100k in game minutes

This is a small bug, but it started happening somewhere towards the end of S4 and beginning of S5. It doesn't just go away either from closing and restarting the client it just stays there across all your games. I think it shows your overall in game minutes you've dedicated to League from when you first started playing since it just keeps adding up never to reset. I thought it'd just go away after a few patches but it didn't not sure what causes it.