There can be serveral reasons why this happening.

One, you are gripping the bow with too much hand/palming the grip.

Two, your dl might me too long and is not allowing to shoot with a slightly bent/relaxed bow arm.

There are a few other reasons that could be the problem, but being a gambling man, I am betting it is one of these two as they are the most common.

Post a few pictures of you at full draw, it will help a bunch.