If you look at the list of tags, "verb" shows as being used only once. But if you click on that tag, you see that it's (currently) being used 16 times.
Is this possibly due to the existence of the verb-agreement and verb-forms tags?
Edited to add:
It's not due to caching unless this site has the most extreme caching rules in existence. Here are some example questions—all over a week old—and when the "verb" tag was added to each:
- August 5:
- August 9:
- August 11:
- August 12:
- August 13:
- August 16:
Or in other words, the count of the tag "verb" should have been over 1 for almost three weeks now…