Do you have verticle "stripes"? That's ribbing. When you turn your work, what was a knit is now a purl because you're looking at the other side and the purls are now knits. Clear as mud?
If you go here and scroll down, you'll find a video of ribbing. http://www.knittinghelp.com/videos/knitting-tips
There is a continental video and an English video, your choice.