Property taxes for a 'ghost unit'?

[Nat C.]

I own a property undergoing development in Miami.

It's only approved to be a duplex, so 2 units. Yet there are 3 folio numbers for the property under the City files.

When I recently paid the property taxes I had to pay 3 lots of taxes at around $800 each. I'm wondering why I paid 3 lots of taxes when there are only 2 units and there is only allowed to be 2 units under zoning regulations?