My guess would be that you might have forgotten one of the two knit rows somewhere. You can give yourself a good lesson in reading your knitting if you start several inches before the change and 'read' each line- point out to yourself row 1, row 2, row 3, row 4. Then by the time you get to the change, you might be able to recognize what you did.
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