Forum:Only 10 visitors per boat (level 16)

So i've been playing again now on my new cell phone for a few days and everything went fine. But now all of the sudden I have only 10 visitors per boat load. I'm on level 16 at the moment. There used to be much more.

Is there something I did? Do you need a minimum number of roads (because for space reasons I keep it to an absolute minimum)?