I wonder about twisted knit sts also. It looks like there are some in the knitting back and forth (purling correctly on the back of the row will give an untwisted knit stitch on the front) but the circular portion looks like the knits are pretty consistently twisted.
Are you knitting into the back of the stitch from the right instead of knitting into the front leg
of the stitch from the left? Twisting the knits is a way to tighten up a rib. It looks pretty but it may not be what you want.