I'd say it's just the playfield clear coat needing to be cleaned out a bit more from the star rollover inserts. Very common with all clear coated playfield's. I use a scalpel ( available at hobbie stores) and carefully cut the extra clear from between the star rollover insert. It can take a while to get them right. Once you think you have it check the clearance with the white star plastic upside down so you don't damage the little clips on the underside of the insert by pulling it in and out to much.