Quoted from sevenrites:You beat me to it, but just in case people still don't see it, here's a different take on the same spot. While minor and difficult to see without a discerning eye, it's definitely ghosting or beginning to ghost in that spot. There's another insert or two elsewhere like that as well. Also, the ink layers on the playfield don't appear to be exactly precise or matched perfectly in some spots.
I thought that was ghosting at first too (I considered buying the OP's game) but then I started thinking it was just one of the angles/lines under the insert.
Not sure what to call the zig zag texture under the insert but theres a possibility thats what you're seeing?