well my guess would be that when you are starting a new row the yarn is being pulled in a way that it makes it look like you have an extra stitch there. Like when you are garter stitching, if your yarn is up OVER the needle when you start working it, there will be an extra "leg" there that looks like it needs to be knitted. Basically you are doing a yarn over. So you just need to be sure that the yarn is back UNDER the needle when you start.
As far as how to fix it without frogging it...that is really all i do...just K2tog and move on. As long as the yarn isn't too thick i don't think you will really notice it.