The Last Iron Fist

the curser goes crazy when i click on anything. i am on a Macbook and i have al the updates but it still flies across the screen. Is there a way to fix this?

I downloaded the free trial and i have my hero and everything but when i go to click on a person my arrow flys across the screen and its really anoying. once i do click on someone i cant click to start a mission and i am about to just stop playing but i think its a fun game. HELP ME!!!