I don't know I use H2O gone and I don't have any bumps. A flower for you.
Are you sure that it's wss? I have some stabilizer that "goes away" when you iron it which has a "bumpy" side. I don't remember what it's called maybe Heat'n Gone or something like that.
It is Heat'n Gone from Florianni. I just checked on it. Maybe that's what you have?
Libster is right I have not had any with bumps on it but I would put them facing fabric if I did *4U
Shouldn't really matter, as it will all disolve away anyway. But I would put the bumps down facing the fabric so they don't catch in the needle or foot. Oh, got the baby suits from Target. soft and fluffy, $8.99 each.