weird thing going on with my computer,seems to be green joker related

ok this is really strange,but when i loaded up green joker just there,every time i went to click on anything in the lobby the resolution of the monitor would change and everything would be really big-green joker didn't fit on the screen,it looked like safe mode.when i pressed the windows button on the keyboard it went back to the normal resolution,but anytime i clicked anything near green joker,including right clicking the icon in the toolbar to try and close it,the same thing happened.i eventually had to ctrl alt del it to get rid of it.
everything seems to be working fine now.
has this happened to anyone else?
im not really computer literate so i don't know what it could be,seems pretty strange though.