Character will move to enemy fountain and won't stop.

Today, I was playing with Cho'Gath.

Whenever I pressed right click anywhere on the map, it automatically set the way point to the enemy fountain. I fed 4 times because I couldn't cancel the movement. People thought I was trolling but I explained to them I was bugged.

I got to quit because I couldn't play.

Long story short: My champion was forced to go straight to the enemy fountain and I couldn't cancel its movement.