Adoptable ID 0

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My mistake, the owned adoptable ID needs to be 0 if favorite pet is unspecified, not empty/NULL value. So you need to change the empty values back to 0.

But strangely, it works on my demo site and everyone else's site when the favpet ID is 0, only on yours it does not work. Did you modify the script somewhere? I am sure for a fresh installation there is no such problem.