I wish it didn't show Philadelphia as Trenton/Camden. That is so incorrect.
Mapbox does a great job of fixing things with out relying on users to do it for OSM! Just drop a pin and type out the problem and Mapbox's data team will likely fix the problem! These changes go right into OSM.
I fixed a bunch of stuff wrong with my home town and found it pretty gratifying
I also took a look at it to figure out why it was showing up that way. They look like they are the same magnitude of thing (city) and they both have population. I'm wondering if it's actually showing Camden county?