In this Market; this can happen.
Now, you can move left, or you can move right; what is your goal?
If your Goal is to sell the house, you may want to help and work with the Buyers you have:
Have you asked if they have an alternative financing plan, another Lender?
If you gave them an extension and were patient, you might have it sold in another 30 days. But if you start over with another Buyer, you could be there for three months.
Good luck and may God bless