My best guess is that you are doing wrap and turn short rows? When you did the wraps you wrapped the yarn around the bottom of some of the stitches. When you come back to knit back over the wrapped stitches, you need to pick up the wraps and knit them so they don't show. If you go to the video section there's a video for it.
Mommy to two wonderful girls
"I don't have to conform to the vagaries of time and space, I'm a loony!" -Campbell Bain (David Tennant) 'Takin' Over the Asylum'
OTN: Cabled Sweater
, arm warmers, kids' clothes