I have encountered an interesting situation with topology tag on MathOverflow. It currently says "2 questions tagged topology" and only one question was displayed. (See the screenshot below.)
On the other hand in the list of tags and in the tag-info shown when you hover over the tag, it is correctly shown that there is only one question. (Again, screenshot is shown below.)
When this was pointed out on meta.MO, one user suggested this explanation in a comment: "You can see the other question in the RSS feed for the tag. It got some downvotes and was removed by the author, but not before being included in the feed, which is what gets counted." Indeed, when I checked the RSS feed, I was indeed able to find another question there. It seems to be deleted - so the previous link will work for users with 10k+ on that particular site - but at the moment the question can be still seen in the Google cache.
I was wondering:
- Is the interpretation in the comment correct? Are questions counted when they are included in the RSS feed?
- Would the information be eventually corrected? How long would it probably take?
(In this particular case, the complete removal of the tag is being discussed on the per-site-meta. So it is possible that we will not be able to check whether it was indeed corrected. However, it seems that it is not too easy to find a similar situation - a tag which has relatively few questions, so that they can be counted manually, and also has some recently deleted questions.)
There is also another question mentioning deleted questions influencing number of tagged questions: Retagging deleted questions should not affect tag question counts However, in that case it was about number shown in the list of tags, so I think it is different from what I am asking.
Screenshot showing all questions tagged topology - together with the incorrect number.
Screenshot showing the tag info and list of tags - where the number of question is correct.
EDIT: A few hours later the same page correctly displays 1 question. It was confirmed by 10k+ user that the deleted question has not been retagged. So I guess that the most likely explanation is to blame caching.