?? I'm not familiar with that stitch. I know if you sc in the round, as in a tube, it drifts sideways, but SHALLOW sc?

As a matter of fact, if you make a giant square with a humongous number of double crochet rounds, it will start to swirl, too. So there are two stitches that don't like to stack if worked in rounds.

I know, that didn't help at all.