Assigning skills

[raygunpk]

I'm having troubles assigning skills in XML2. For Wolverine, I'm trying to assign a skill to the top slot, [Space], but it doesn't do anything. None of the skills could be put there. Also for Gambit one of the skills I tried to reassign to a button and it just auto assigns to the left slot, [E].

Some skills assign and some don't, any idea how to get around it? I'm using keyboard.