That is because of the tax lien sale before the tax deed sale. The tax deed sale is just the tax lien certificate holder's foreclosure action basically.

Taken from this article Tax Deed Sales in Florida: A Basic Guide

Tax deed sales are public auctions where properties with unpaid taxes are sold to the highest bidder. The process begins when property owners fail to pay their property taxes for a specified period, usually two or more years. To recover the delinquent taxes, the local county government, at the request of a tax certificate/lien holder initiates the tax deed sale process. It is important to note that tax deed sales are different from tax lien sales. Tax lien certificate sales are where investors purchase the right to collect interest on the principal balance paid wherein a lien certificate is received in exchange for payment of unpaid property taxes.