That's how configurables work - they're new tabs.
You can't add it to the original feat tab unless you're just adding feat slots to the regular feat list, and I believe you wanted to limit these bonus feats to only choosing teamwork feats, and if you just added choices to the main list, you'd need to count the teamwork feats and verify that the user had taken enough. Also, the narrowed-down list, showing just the teamwork feats, helps the user sort through the list and find the right one for their character, instead of sorting through the entire feat list (since there are several other feats with the word "teamwork" in their description that aren't in the teamwork category, so a filter wouldn't do a complete job).
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