Why would you short sale, you wouldn’t get anything - you can’t short sale a property to yourself.
Look, I buy at the Palm Beach Co auction. I constantly warn people that there is simply too much risk for the average person in an auction: House full of mold, honoring the existing tenant’s lease, meth houses, current owner pouring concrete down the pipes to spite the new owner, evictions, finding out you just bid on an inferior lien (like you just did), municipal liens, back-due child support, IRS liens ... the list goes on and on.
At least you only lost $16,000. I was screaming at my computer screen when the bidding was up to $25,000 a few weeks ago on an HOA foreclosure that had a mortgage for WAAAAYYYY more than the property was worth. A few months ago I laughed when bidding was up to $40,000-ish for a property where the house burned down ... google maps still showed the house but these bidders didn't bother to even drive by the property in person; the lot wasn't worth $40k. Seriously, AUCTIONS ARE THE FASTEST WAY TO LOOSE YOUR LIFE SAVINGS!!!
When you signed up for an account on the auction site, you checked the box that you read all the disclosures... those disclosures clearly state these properties may not be free and clear from other liens.
Until you know how to search the title and clear it for all superior liens, stay away from auctions.