Animals Spawn keep Despawning

[AyanTheAwesome]

Username: AyanTheAwesome
What you were doing before this occurred: Just walking around.
What you've lost (Only if you lost something): I have about 50k because I had to keep on buying the spawn eggs. I have lost many Cows, Sheep, and Chickens.

Is there a way I can my 50k back? Or something worth 50k?

 

[AyanTheAwesome]

I have tried to name the animal and also leave them unnamed. They still despawn.

 

[Powerfull]

I have tried to name the animal and also leave them unnamed. They still despawn.

Are they in an area 20x20 or smaller? I have heard mc animals despawn if they are let outside that range

 

[Death]

Are they in an area 20x20 or smaller? I have heard mc animals despawn if they are let outside that range

I dont think so. I have a small farm in a building and the animals dont despawn

 

[Marshmallowsmalk]

The animals shouldn't despawn, unless that would explain my missing named polar bear....