Are you doing the large or XL? The L ends up with 150 sts and the XL 156.
After you did the ribbing did you do the increase row before going on to the pattern stitches?
"Rep last 2 rows until work from beg measures 1½ ins [3 cm], ending on a 2nd row and inc 10 (8-10-12) sts evenly across last row. 144 (154-164- 174) sts" And if you did do this inc row, did you inc the correct amount?
sue- knitting heretic