In PA, a seller can insist that you be pre-approved by a lender of their choice. I've had this happen sometimes when a buyer client purchased a bank-owned foreclosed property.
Also, in PA, buyers specify what lender they will use in the agreement of sale and the seller can reject your offer on that basis. It's a slippery slope for the seller to insist on specific lender but they also can make recommendations of which lender would be acceptable to them.
I hope that helps, Good luck in Florida - There are some bargains down there.
RE/Max Professional Realty, Inc.
Office (610) 363-8444
Direct: (610) 363-4095
I think they are just trying to try something with you.
My two cents.
Are they opposed to you using another Fl broker? Just seeing which issue it is