Hey that's cool, never saw mine do that.
My Dolphin M5 will make it up to the second step and try for the top when he has in his spring carts, and ballasts out. Otherwise, he gets the bottom step just a little. For what he does, I can't complain at all and am amazed every day how much help he is. I've not hooked up my vacuum hose since he arrived. Not sure when I will either. Also never seen him get stuck where he needed help getting out either. He just turns or backs up, then off to work again.