I built a pen for Red Pandas and put in a pair. Soon they were both showing social problems. On investigation it was telling me they didnt have enough space, even though the pen was as big or bigger than the ones in my other franchise. I thought it might be that I had made a hill with a cave in.. so i levelled that and re started the game but still showing the problem and it was going to kill them. I built another pen next to it and it was fine. I then tried to put some other red pandas in the first pen after deleting the pond id made and it showed the same with the red pandas getting mare and more social problems quite quickly. I expanded the pen into the next door to give more space but still the same problem. I took out half the trees and still not enough space. The problem pen below is the one on the left which you can see is way bigger than the one on the right that has 2 red pandas in. There is nothing I can see that has caused this and i have not had it in any other habitat.