Help with pattern

Help! Has anyone out there made the Soft & Sweet Baby Afghan by Evelyn A. Clark? I’ve got quite a bit done, I’m coming up to a yarnover row. The instructions are to K1, (P1,K1) 4x then to (K2 tog, YO) across to last 10 sts, K2, (P1, K1) 4 times. Everything is fine until the lst 10 stitches - 1 have 11 stitches! I thought I dropped a stitch somewhere - but that doesn’t appear to be the case. Any ideas?? Thanks.

I don’t know this afghan, but from the info you gave it sounds like there is a 10 stitch border up the sides. The first side only has 9 stitches. Maybe you should start with a k2 if that is consistent with the rest of the pattern?

Go back over the row you just knitted and make sure you did each stitch right. Maybe you forgot to k2tog somewhere and just knit 1 st.