This question is an exact duplicate of:
This URL specifies a tag search for Go jobs ("tag/go"):
However most of the results aren't tagged "go." (Tags are indicated by blue rectangles.)
Instead, results include jobs that merely refer to the keyword in the body of the post. A tag search should only display careers that are tagged with the search term.
Note that this is true of any term, not just "go," which is admittedly more generic. Searches for "ruby" or "python," for example, reveal the same issue--results that aren't tagged with "ruby" or "python."
A tag search should only search tags, exactly as implied by the URL.