I just made a Google search for "ux stackexchange forms". The first result correctly points to
.../tagged/forms, but the second result points to
...?tags=forms, which has no effect:
The link, https://ux.stackexchange.com/?tags=forms, takes me to the home page for the UX Stack Exchange site. I'm guessing this is an old URL format which is no longer in use?
Interestingly, I completely skipped the first link when reading the search results, as the term "forms" is more prominent in the second link.