Do you realise how many times WGT has heard
"I never had any problems with premature eclickulations before meeting you WGT. SO its NOT me , it must be you!"
In truth , very doubtful its on wgt's end. Try going to programs and deleting your flash player and reinstalling. That sorts out odd flash bugs that creep in from time to time.
The same problem happened to me when I was first learning how to do it. . For me it was over excitement. When sliding mouse for back swing, my finger flinches on the mouse button.
Changing mice (mouse) fixed that as new one is stiffer to click which cuts down on my premature eclickulations that frequently resulted in unwanted messes.
Eitherway good luck with your prob