New Class:Fencer (Bug)

i made my first character a Fencer , it was doing well but after i changed class to closer and hit Lv74 my Karion Fencing skill got bugged out ... i can't spam it and to use it again i either have to go through a loadscreen or reset skill which are not viable options for dungeon battles... 

am i doing something wrong or is the game bugged please help me figure out ... i tried changing the Hotkeys and using mouse it still got to results ... i really like this class and want to continue playing so please fix it 

character name: XiONKale