Sweater help

Hi yall,
I am currently knitting a sweater and have knit the front piece and the back piece almost completely, however I am having trouble with one portion of the pattern that talks about the shoulders.

a)Back
**With smaller needles, cast on 95 (99-103-115-125) sts.

***1st row: *K1. P1. Rep from * to last st. K1.

2nd row: *P1. K1. Rep from * to last st. P1.

Rep last 2 rows (K1. P1) ribbing until work from beg measures 2½ ins [6 cm], end with a 2nd row.***

Change to larger needles and proceed in stocking st** until work from beg measures 27 (27½-28- 29-30) ins [68.5 (70-71-73.5-76) cm], ending with a purl row.

Shoulders
Cast off 30 (32-33- 38-43) sts beg next 2 rows. Leave rem 35 (35-37-39-39) sts on a st holder.

Im confused about what the instructions for the shoulder are asking me to do. I think it means to take the back piece and cast of 30, and to leave the remaining stitches on a stitch holder, but after casting of 30 there are 65 stitches left not 35…am I missing something?

Welcome!
The instructions are telling you to cast off 30sts at the beginning of the next [U][I]2 rows[/I][/U], so that’s 60sts total cast off. Since you’re making the smallest size, that leaves 35 center sts to be put on the stitch holder.