So I am new to knitting, and I read through the sticky about extra stiches, but I am not sure if that is what is happening here. When I knit a row i often find my last stich to be larger and i can't get it to tighten. and it leaves a pretty loose loop to try to work with. It also makes it look like there is another stitch there. Any ideas on what i am doing wrong? I think I am keeping the yarn in back, but maybe I'm not?