Mine is the same. Dealer says normal. I don't like it but I guess unless it tears it's not a problem. It's like the glue didn't stick to the roof in some spots.
Local camping supply store says you can inject cement using a hypodermic needle. Taking mine in for some warranty work Tuesday and will show my service manager to see what he says.
Mark and Joanne
2014 Fun Finder XT 276
2015 Ford F150 Lariat 3.5 Ecoboost 4X4 SCrew Max Tow
2011 Harley Road Glide Ultra