I believe I have discovered the issue. After messing around a bit, changing towers and moving around, the frog to reach the exit turned around and started to go through the maze backwards. It appears that the frog successfully made it to the target pathing point, and then either gain aggro on me or a tower. Here is an image of a frog with aggro on a tower, facing left and not moving. The frog has also followed me while I was in the trench. I am unable to replicate this again as I am likely going to die this round. Hope this helps.