Getting stuck on turret geometry

This has happened a few times in Summoner's rift on LEFT SIDE (farthest middle turret away from base) and on Howling Abyss on RIGHT SIDE (closest turret on the right hand of nexus). Recently I was playing LeBlanc and I told her to go to the middle of the map from spawn, and I stood there, stuck, indefintely. Same situation with each game. Tell my champ to travel long distance, get stuck on the geometry whilst there are no minions remotely nearby.