Did you turn your work so that you are only working on 18 + 2 sts, meaning, 20?
(r.s.f): Work across 50 sts., turn and cast 2 sts. then k. 18 back. Turn and cast on 2 sts. Cont. in reverse st.st. on these 20 sts. for 2 ins. (or length required). "[/COLOR]
What you're supposed to do is work 50 sts.
Then turn your work so you're going back over those 50 sts you just did. BUT-- you first cast on 2 sts. Now, start working back over those 50 sts, but STOP after 18. You cast on 2 new sts, plus the 18 you worked back over, that's 20. At a gauge of 9 sts per inch, that should be about 2" wide, which is right.