[Gameplay] My Champion automatically walked to the enemy base when the game loaded

(I was playing Nasus, if it makes a difference.) The game took a long time to load, like ~10 minutes, and when it did, my character auto pathed to the enemy base when I clicked to walk to top lane. I tried clicking to walk somewhere else, and pressing s to stop, but neither stopped my character from running up mid lane to the enemy base. I didn't wait to re-spawn to see if it happened again, i just reconnected which fixed it.