Breast Aug Scar is a Few Inches Above the Fold Line - is This a Mistake?

Your incision is too high (or your fold is too low) and your surgeon would probably agree.  Although this is not ideal, most breast incisions that are not in the crease end up being practically invisible in time.  If the scar is really in the wrong place, it can be revised but not really moved.  Probably best to leave it alone.

In my practice, this typically happens in women who start off with a fairly small cup size and add a large implant. A patient's chest wall is designed for only so large an implant, but most women I have encountered routinely go larger than their normal dimensions will allow.
When your surgeon marked you before your augmentation, he/she probably marked the incision right in your breast fold. If the implant was large, the pocket would descend below this margin causing the incision to visually rotate up onto the breast. As Dr. Rand has said, however, your implants may have descended too much and can cause the same basic visual problem.
I would ask you to speak to your surgeon about your concern and see what their analysis of your situation could be. Good luck.