Found a graphic glitch with the base (lowest tier) animal pen. After my jaguar was all grown up and I took it out of the pen the graphic of it in the pen remained.
Steps to recreate:
catch an animal
place it in the pen
wait for it to mature
remove it from the pen and place it in the world
go back to pen to see the animal graphic still inside the pen w/o the animal actually being in the pen
I have not tried this on a higher level Animal Pen. Nor have I tried it more than once.
It happens consistently with horses after you remove them from the stables on Testlive both Server and Singleplayer. I think it also happens in Live, but I can’t say for certain right now. As far as I’ve been able to tell, it’s purely cosmetic and temporary. It might be one of those “leave render range then return” things.