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I have observed in Stack Overflow that sometimes there are major differences between the number of questions shown for a given tag in the Tags page and the number of questions you see when filtering questions by the same tag.

I have observed the same behaviour, although not as evident, in other StackExchange sites as Server Fault.

This behaviour seems to become more evident the more questions the specific site has. For example:

  • The SciFi site, with only 16322 questions, seems to be unaffected.
  • Server Fault(182473 questions) seems to be beginning to be affected in some cases.
  • Stack Overflow (over 8 million questions) seems to be more affected than Server Fault (although since I first asked the question number has changed a lot so I could not find as much examples as back then).

Some random examples from today:

  • [security] (Stack Overflow): 28688 questions in Tags page and has 29805 questions tagged. Today 24 questions were asked.
  • [visual-studio-2010] (Stack Overflow): 43021 questions in Tags page and has 43172 questions tagged. Today 23 questions were asked.
  • [networking] (Server Fault): 8576 questions in Tags page and has 8554 questions tagged. Today 7 questions were asked.
  • [linux] (Server Fault): 23817 questions in Tags page and has 23773 questions tagged. Today 12 questions were asked.

I guess that tag statistics are not real-time but calculated daily (nightly?) so that would account for a relatively small difference but not all of it.

Anyway, whatever it is, it is not site-specific or at least not Stack Overflow-specific.

Can anyone explain this behaviour?

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closed as off-topic by nicael, Shadow Wizard, rene, Eliah Kagan, bmike Sep 29 at 20:48

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question pertains only to a specific site in the Stack Exchange Network. Questions on Meta Stack Exchange should pertain to our network or software that drives it as a whole, within the guidelines defined in the help center. You should ask this question on the meta site where your concern originated." – nicael, Shadow Wizard, Eliah Kagan, bmike
If this question can be reworded to fit the rules in the help center, please edit the question.

3  
If it is a duplicate I will delete my question. Please don't delete it but vote/flag to close the question. Now to your question, I believe that caching has to do something with this. It may not be feasible to keep all the stats up-to-date. There could be a scheduled job which run at fixed intervals to update the latest counts. –  Aziz Shaikh Jul 11 '13 at 7:24

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