Yes definately a form issue ,try this , Just something I haven't seen anyone else mention which I've learned in the past . Don't stand so square to your bow ,slightly turn your feet and shoulders facing your target a bit as well as trying to rortate the palm of your hand out. It will help get your arm away form the string.
I learned this the hard way LOL
I have a pic of a friend incorporating this and I'll send it to you if you send me your e-mail addy.
[email protected]
nubo