I can't speak for vBulletin releases, but members on here sharing free mods, usually make these on a test site, and try to find as many issues as they can.
Sometimes it is quite difficult to test things when you are working alone on something. Every software / mod ever released has some kind of bugs with it. If it were kept in development till there were no bugs at all, it would have to be updated again, as the core software the mod was developed for probably would have been changed by then.
Another thing is some bugs don't show up in a testing environment, that may show up on another users server.
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