Could be something wrong with the bow, or your release, the wrong arrow, or even bad heads.
4 problems I've had are bad heads, inconsistent arrows, bad cam on bow, poor release. Without question bad arrows have been the number one reason. I can take one and pretty much bore a hole through a back stop, change to another arrow and the impact point will change.
Just got a work it out to the best of your ability. With everything that's against the shooter it's no wonder confidence problems are so prevalent. It most likely ain't you.
Really need some kind of legal action in the hunting industry to force manufactures to sell what they claim if they wont do it voluntarily. The excuses are too many and too much for the top dollar we spend. For the money we should get "Which check needs wiping sir." Can't think of any other industry that charges top dollar that doesn't give a top effort.