Quite often, you can hover over labels on the Stack Exchange site and a tooltip will tell you what they mean. Case in point: for the Top Users:
You can also click on the '25', and it will show you all answers by that user in that tag (though it's not filtered on the last 30 days).
This list is sorted by total score, and as @Catija notices, you have to have a score of at least one to appear there. That's probably the cause of your confusion.
For your own profile:
Here, you can also click on the 3, or the tag itself, to get a list of your posts in that tag - though it will contain both questions and answers.