Minions walking back to inhibitor turret from across the map (twisted treeline)

Just played a bot game for TT where a superminion and caster minions that was at the enemy inhib followed a bot just outside of nexus turret range (they lost vision of the bot and there were no enemy minions around) and then walked out of their base to my teams base through the jungle and then restarted pathing to the enemy nexus.

Basically their targeting got messed up and they reset their pathing.

Picture of 2 minions walking from blue team base back to purple team base through jungle (we are purple team) http://gyazo.com/a69201abf1e5eaabf3d3fb9b9165b195