Florida Tax Deed Auctions and Liens

There are a few homes in my county of the state of Florida that are going to tax deed auctions. One of the homes has over $36,000 worth of city liens on it. If I bid on that home and win, are the liens  expunged so to speak or would I be on the hook for them?

Also, another home appears to only have one lien of $250; however, it was foreclosed on. I am kind of confused on why it would have went to a tax deed auction and not a foreclosure auction. Can anyone shed any light on either of these questions...

    Thanks in advance.