Why is Turbo Tax asking me to pay $64 more to file state taxes in FL, even though we don't have state taxes?

Florida does not have a state income tax.   Only people who have Florida businesses or rental property with tangible personal property have to file a DR-405 with the county property appraiser by April 1.

https://floridarevenue.com/property/Pages/Taxpayers_TangiblePersonalProperty.aspx

and

https://floridarevenue.com/property/Documents/pt114.pdf

If you don't have a Florida business or rental property with such tangible personal property as described at those links, then you do not have to file a Florida return.  You can choose to skip the Florida return, or delete the Florida return before paying and filing if it's not needed.

FAQ:  How do I delete a state return in Online TurboTax?

https://ttlc.intuit.com/turbotax-support/en-us/help-article/state-taxes/delete-state-return-turbotax-online/L8v9awRbh_US_en_US

If you've already paid for it and don't need it as explained above, you can talk to TurboTax Customer Support and tell them you didn't need it.

FAQ:  What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632