As a Florida Mortgage Broker, I've seen it all!
When dealing with the Gate Guard (i.e. listing agent) , I've seen and heard, more often than not, about them ...."Sand Bagging"...the offers getting thru to the seller in effort to grab the entire 6% in realtor points!
Seems this unethical behavior happens all the time. This why many buyers, in addition to submitting their offer thru their buyer's agent, will Fedex or Certify mail their offer, their pre-approval letter and escrow letter directly to the seller with their contact info asking them to contact them directly
Or if a re-sale, some will simply circumvent the gate guard and go knock on the door after 6:00 pm. to meet the sellers personally and deliver their offer to them in person.
Being able to Grab that entire 6% realtor points (Ex: $300,000 x 6% = $18,000) can make some do things that they would normally say is unethical when others do the same.
Nevertheless, you have to believe that, for one reason or another, the property you were bidding on was not meant to be.
Eventually you will win the right one.