Nike women’s zoomx invincible run 03, size 6 worn once

My husband accidentally bought me the wrong size at a Nike clearance store so I was unable to return them. Box says 6.5 but the shoes are actually size 6 and the newer model. I tried them once for a 4 mile run but they were too small. No flaws. I absolutely love this model of shoes otherwise (in the right size!!) and have trained for multiple marathons in this model without injury!