Smooth side of stockinet the stitch looks odd

I find that the smooth side of my stockinette stitch has the left side stitch almost straight up and down and the partner right stitch slanting upward from right to left like one strike of an X. I had thought that the left stitch would slant up and right, meeting in the middle the right stitch.

Does anyone know what would cause my stockinette smooth side stitches to look off-center? I will appreciate any suggestions or help.

Thanks!

It may be similar to the 4th photo in this article from Knitty. It’s due to the yarn ply and not your knitting.
http://www.knitty.com/ISSUEfall05/FEATwhyply.html

Thanks so much for the info!