Here is what happened. In vBulletin options, I checked "Never Expire" for warning points. And I set all warnings length to 0, which means forever. Then I gave someone warning points and it said "forever" in warning length. Then the next day, I found that the warning had expired and the expiration date was the day before the warnings were issued. And when I prolonged the length into 2000 days, and after a day, the warning value decreased. I think this is abug.
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