I could have sworn that the pattern was wrong, me poor brain
If you are just looking at Row 5, I charted it, and it all checks out; you should have 17 stitches at the end of Row 5.
K1, yo, sk2p, yo, k3, yo, sk2p, yo, k3, yo, sk2p, yo, k1.
Try this sequence, if you are still coming out with the wrong number of stitches, you'll need to check your work, stitch by stitch, to determine where you've gone wrong.
Hope this helps.