Jurassic World DLC keeping on being deleted.

When I finish collecting all the dinosaurs or all the hybrids, when I join the next day, all of the map is gone, just a flat world. The mb is still the same, but there's no Isla Nublar, Fossil Dig site, or Amber Mines. It said it's because I have too many worlds, but I deleted a lot and the next world I make, GONE AGAIN. Please fix this bug.