yeah I had no idea what the hell that was either when I first saw it. it's alot more prevalent on some games then others, Especially if the game was brand new when you put it on.
I assumed it had to do something with the new clearcoat. Like thundergod76 said nothing to worry about, just sucks that it looks wet.

The other thing that kinda sucks is on some games, mainly sterns the protector seems to lift in certain areas. I've been using that double sided tape, that cliffy uses on his protectors to get it back down. Doesn't affect gameplay just looks weird when the ball rolls over that area. Assuming this is due to the uneven areas though the playfield. That's if the protector isn't pushed up on something like a post.

Pro's far outweigh the Con's IMO.

I played a bunch of games with my star trek before and after. the same with my medieval, The only real difference I noticed was there was less spin. I could of been imagining that though. if anything it plays a lot faster, most new sterns have tons of uneven levels on their playfields and of course mylar that tends to hang the ball up on occasion.

Also if you've seen some of the new sterns after they have been at these free play places for a month, the dimples on those things are crazy. All the other manufactures have them to, but they are much less noticeable. This goes to what type of quality of wood they are using on their playfields. slow grown/fast grown, pine, oak etc..
granted a routed game will get played a lot more, but still...
These are expensive toys, and a protector gives piece of mind. I have them on all my games (most), mainly in case I'm not able to clean them for a prolonged period of time while they are on location. Think the biggest benefit is the resale value, for a 100 bucks and 4- 12 hours of time that aint bad.

one game that it's really bad on is ghostbusters, run your hand down the playfield you'll see what I'm talking about. Compare it with their newer games or another manufacture. I would assume it's the same with GOT since it was made in the same time frame, I have one, I remember thinking it was the same but not as bad. it's not like super uneven, but it's definitely not flat. like the inserts weren't leveled correctly or something. real close, but not quite.

it's probably not going to impede anything at least not noticeably.

they have done a lot better job with it with the last few games. with guardians there were no uneven levels, think that's when I noticed the difference.

well, not sure what to tell you, maybe it's just the sterns I bought from that time frame.
Never said the levels were going to "hang up" the ball. Uneven levels probably would slow a moving object down to some degree, not noticeable to you or me though.
not sure if I said it in my post, I meant the mylar has a tendency to hang up slow moving pinballs. which was an added benefit of installing one of these. had mylar interfere on several occasions.