Jurassic World: my dinnosaurs disappear.

In the Jurassic World map, my dinosaurs starting disappear without reason. Disappear dinosaurs those I've created, those they comes with the map and also who I put in a transport crate (I put it on a crate, and when I going to liberate it, I press the button and it give me the empty crate but the dinosaur doesn't appear). Please fix it as soon as posible.