Try skipping a stitch between puffs on the first round, and working in the ch 1 between the puffs on subsequent rounds. That should take care of it...you never know how things are going to turn out, what with different yarns, tensions and whatnot..but skipping the stitches should fix the rippling! Good luck!
skipping the stitch took care of the rippling, i think my yarn must be a little on the bulky side of worsted. i frogged it from an old pendelton angora sweater. i love the puff stitch for hats. so adorable. i want to use it for a beret next time.