I'm still new, but here are two things I've learned about knitting on circulars.
First, make sure your stitches aren't twisted when you start. Cast on, and then make sure they're all lined up the same way. The video on this site is good to show that.
And then as you knit, you'll need to keep sort of readjusting your stitches (spreading them out as they bunch up on the right needle, so you can continue to get to them on the left needle). Just be sure as you pull those on around that you're not twisting as you go.
I don't have any particular suggestions if it's the cords twisting, except just being careful to have them straight when you start out.