(Old Shale) Shawl pattern help

Hello! I’m Makenzie, and I’ve been knitting for about two years. This about the third time I’ve attempted knitting a shawl with no success. I love the pattern, but it calls for me to work more stitches than I have, starting in row 1. After doing a garter tab, which starts me off with 11 stitches, row 1 says to k3, yo, k2, pm, k1, yo, k2, yo, k3. I’m supposed to end up with 15 stitches, but I always end up with one less. I’ve had this problem with other shawl patterns too. Can someone please help? Screenshot_20181029-104506|675x1200

Welcome to KH!
Maybe this one?

For Row 1:
Row 1: k3, yo, k2, yo, pm, k1, yo, k2, yo, k3

there’s an extra yo which makes 15sts.