Most houses that fall out of escrow do so because the buyer found something during the inspection period they didn’t like. Others, because the loan wouldn’t go through. Maybe the buyers had bad pre-approval letters, maybe there was a condition of the property that came up during underwriting and the underwriters rejected it. There are tons of things that can go wrong, but the end result is always a dejected, frustrated seller who had their hopes up when they went into contract and found themselves crushed when they fell out.