You're either messing up somewhere or you have an odd number cast on.
Re-count your cast on.
Knitting them as they appear doesn't work for me until I get a few rows and can see how the row appears.
I can't always see what the one on the needle is unless I tug on the piece. Until I get 2 or 3 rows I have to trust the pattern.
If you have an even cast on and you're not doubling a K or P and you're not going a few rows before worrying, try going a few rows, it's only 24 stitches.