Deleted habit still appearing

Device: iPhone, Macbook, iPad, synced and all updated

I have used the “delete all data” option to reset completely, which was successful with about 10 habits, but there is just one lingering habit that still appears on my list and affects my completion rate. I have done the “delete all data” on my iphone, my computer, and my iPad. It doesn’t appear now on any of the active habit lists, but it still appears when I get the email with my completion rate update. How do I delete this last stubborn habit?