Sure I found it but only because you pointed it out! (Why do we do that???) I'd leave it as is and smile every time you show it to someone and they DON'T see it without you showing them. Very pretty.
Call it an Amish block. They always put one mistake in their quilts on purpose for humility. It's beautiful, and if you didn't say it was a mistake no one would notice.
Your colours are really pretty. I would fix that mistake if it were me though. Also ... I'm wondering about the spacing of the others? What is the actual pattern name?