Counteroffer in short sale and bankruptcy fees

[Thuy Nguyen]

My offer for a bankruptcy short sale was accepted by the seller. Then the lender got an appraisal months later and countered with a higher price. Then today, I received copies of my purchase contract that was signed by the trustee at my original price. Is it legal for the lender to counter if the trustee has already signed a purchase agreement? Before I knew about the signed contract (it was mailed to me), I countered with another offer. I still have not heard back yet, but I'm just curious if anyone has heard a bank doing this after the purchase contract was signed? 

Also, in the documents mailed to me, there was an escrow breakdown and they are charger me (the buyer) a bankruptcy surcharge to the Bankruptcy estate of the seller. Why am I getting charged for his bankruptcy? It's over $13k. Is this legal too?