The bow was shooting good yesterday but nothing worked right today. Been there, done that. Got the freakin' T-shirt.
Everyone has bad shooting days. Some days we' ve ' got it' and some days we don' t. Maybe your shooting just wasn' t up to par today. Trying to fight it and MAKE the bow shoot right when the problem is actually you having a bad day is nothing but an exercise in frustration. The harder we try, the worse it gets. Give it a rest and try again tomorrow. Then, if things still aren' t working out, you can start worrying about the setup.