I changed the milestone on bug 125066 from 2.18 to 2.16. When I look at the bug, I can see that it is "Bugzilla 2.16" but when I query for it, it still says "Bugzilla 2.18". A good query to reporoduce this is to search for Bugzilla bugs with the word "milestone" in the summary.
I believe you're running into the "shadow database" used on bugzilla.mozilla.org. It is a copy of the primary database that is used for querying and other purposes to take the load off the primary database. Sometimes the replication to the shadow database falls behind, though. (See Bug 75840.) The activity for the bug lists it as having a 2.16 milestone: http://bugzilla.mozilla.org/show_activity.cgi?id=125066 This bug should probably be closed as RESOLVED INVALID or RESOLVED WORKSFORME.
It seems to be caught up now. How long does this take?
Depending on the server load, anywhere from 10 seconds to an hour. (I've seen it longer than that, too, if something gets broken, which happens occassionally).
Status: NEW → RESOLVED
Last Resolved: 16 years ago
Resolution: --- → WORKSFORME
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