Search in "taxonomy terms" does not work properly

Hi! The search is configured to only search in ONE taxonomy term : “Kontor – upptagningsområden” for custom post “kontor”.
But strangely enough it also returns on taxonomy term: “Kontor – tjänster”.

Try it out here: http://www.veteranpoolen.se/sok-omrade/
If one search for example “Stockholm” (thats in taxonomy term “Kontotr – upptagningsområden”), the result is correct.
But if you search for “snickare” you should get no results. But stangely enough you get results from the taxonomy term “Kontor – tjänster”.