LogFAQs > #903561565

You hurt your pec-delt tie-in. It can happen when the outer pec is overloaded. Change your form to bench like a powerlifter: https://sites.google.com/site/strengthfaqs/benchpress

What will directly alleviate this is benching with your elbows in, not out, so your triceps take over more. Bench pressing the common way isn't too joint-friendly when you start pressing heavier.

Unfortunately this will make it so that the bench press doesn't work your chest as much anymore so add some dummbbell pressing in, too.
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