Most likely your string/cables have stretched/creeped a bit. You will have to re-position your peep once again so that it rotates into position at full draw. You will have to continue to do this until your string/cables have settledin and stop creeping....if ever.

Some strings/cables will continue to creep, others that are made with better quality materials and more importantly bettermanufacturingwill settle in after a few shots. Remember, even the best made strings can still slightly creep due to extreme weather changes, while not common it still happens.