Originally Posted by
HouseDragon
It could be "invisible" stains on your pressing surface.
Try pressing on a different surface and see if the stains appear.
HTH!
It just may be your ironing surface. I had this issue recently. While the surface did not look "dirty", when I stripped off the layers (I use a board covered with batting and muslin), the underneath layers were. New batting and new muslin later all is fine.Good luck!!