It sounds like a blush, moisture (water vapor) trapped under the poly.
Not usre how this happened. Was the stain completly dried? Was it
Regadless, try rubbing the spots with mineral oil or vasaline. Leave it
wet with the oil for a few hours and it "may" replace the water
moisture with clear oil. You actually should be in good shape if you
used the wipe on poly correctly and have just a very thin coat.
Other option invloves sandpaper. Lots of sandpaper.