Guy I get work from had a sweater from his daughter, a new knitter. I was looking wondering how she did that. Then it struck me, it was a RS/WS knit item and she had tension difference between knit and purl. Somehow her legs were different depending on which way she was going. It gave it an interesting herringbone effect.
I'm sure if she was doing in the round her long leg would be all the same side. This is an extreme example of the difference between knit and purl.
I'm also pretty sure as she gets experience her legs will even out, I can't even figure out how she's doing it and it doesn't clear up with washing. I've never seen her knit
Almost everyone has some tension differences between K&P. My DK hats with few color swaps are different sizes between the knit side and purl side.
If you posted a picture someone could figure out what the difference is.