I don't see a dropped stitch, either.
It looks like you could have picked up your knitting and started working back in the wrong direction at that spot. The only way to be sure, though, is to unknit to that spot. If your yarn is suddenly on the wrong needle, then that's what you did.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry