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I just did a search on is:q wheelchair.
This is one of the questions that shows up:
This shows tags air-travel and aircraft.
However, when I click through to the question
this shows three tags: air-travel, aircraft and accessibility:
Why the discrepancy?
This is most probably a caching issue. Search result caching does not get refreshed as often as questions and answers. If you wait a few hours the problems should most probably disappear.