Isn't that a fabuous feeling when everything tilts and suddenly makes sense?
There's actually 2 row 25 in this pattern, one for the left strap and side and one for the right. For the right strap, cast on the 10 sts onto the needle that has the 10 sts that you just knit. Pattern seems to want longtial for this but you could use the knit or cable cast ons as Sue suggests and avoid some extra tails of yarn. Take a look at the picture. Then yes, you would work rows 26 and 27 on all 20sts.