During a normal game the minions in our lane got stuck on the ramp and never moved. They started getting stuck at ~1:20, and then the wave just started building up more and more until the enemies got so far behind in money that they never came back.
Bumping this because I have just encountered the same bug.
MATCH ID: 18753120 at 2:20 Amber Hand yellow lane. Multiple stacks of troopers formed, meaning the Sapphire Flame pushed easily, but had a huge loss of net worth early game.