Yes, I can see that and it's a common problem w/ poly if you over-apply. Sanding will get rid of it but you may have to sand down to the wood. With shellac you can get rid of it by rubbing with DNA but I don't know if that works with poly.The marks are in the poly. Thinking I may sand today and put another coat of poly on. Had no problems with the stain or other coats. Will use a new brush as well.