Despawning Animals in VB

I've been helping EliteMushroom68 get cows to their base, which is an island built around a post in the middle of the ocean, but the cows keep despawning. I'm bringing them via post teleportation, not sure if this is the cause of the problem but it's got to have happened at least half a dozen times at this point. If someone could look into this and figure out what the problem is, that would be great!
 

Schuttle

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Apr 14, 2010
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Thanks aqua, I won't be able to look at this too soon, but keep be updated on how it progresses.