My slide roof looks like Eternabond. It looks as if it was stretched when it was installed, and has pulled up in the center. I would call it wavy in places. I have never been concerned as all the important places are sealed. If it is true ripples with fold overs, were the wiper seals could not get a good seal, then I would be concerned.
Have seen many like this and our 2018 MLOK has ripples in the kitchen slide. It is not from water damage and you may find the ripples are reduced depending on weather temperature. My contacts (I know two at different dealers) have told me this is quite common however I must admit I would prefer to see the membrane fully adhered to the roof structure.
Good question Klassic ... I missed that as I was looking only at the ripples! No idea why they would add that to the roof as it is only one more entry point for water that could lead to costly repairs. Not the best idea either IMO.