The bid price was what it was. The lender gave instructions to the trustee to set it at whatever it gets set at.
The buyer may have needed to resolve any irs or tax liens. There may or may not have been open building permits as well. Any other liens behind the first lien such as seconds, or helocs or stuff like that all get wiped out.
Trustee sales are a risk. It is a tough call but I would not recommend it for a novice.