Ah. Sorry about slope confusion. I just saw the red slope objects in the resources.
I am on a Mac. I also can't figure out what is going.
read_controls looks solid, state_ap_player_stand and state_ap_player_run and ap_move_player as well.
The weird thing is it is only run left and standard jump left. But the character will turn and move left if the down arrow/jump dash is used.