Hmmm interesting so it's definitely the habitat. Do you have a screenshot of the habitat gate where they are bringing the animals? If it were me my first steps would probably be to try taking out key elements one at a time and trying each one e.g. try removing the water and then placing them, try removing the enrichments and then putting them in, climbing structures etc. It might be a bit painful but it might help rule out some stuff.
Habitat looks great BTW!
I've already tried if it helps to place the Gate somewhere else. Also completely rebuilt the whole Barrier 3 times now. I know that it works when there's no Water in there. But Saltwater Crocodiles cause no Problems in there for some Reason when Water is inside. Chimpanzees let it crash even though they can't even swim. I've just tried if it helps to change the Ground underwater a little bit. It also didn't help.
Also, thanks. I really like how it turned out too. I hope it is just caused by a single Tree or something similar. I don't want to need to delete everything in there just to make it work. I'll try now if it helps to delete everything in there except the Water and if this works, I will try to figure out what exactly causes the Problem.
Here are the Pictures of the Gate
Yes, I know. There's a Gap. Rebuilt the Barrier for the third Time and didn't fix it yet