(Maybe) your (the searcher's) NDA explicitly informs the seller (and the broker?) NOT to disclose any information about you to anyone not directly involved in your potential transaction. But the seller/broker/whomever let's the word out. Your boss fires you. Or, something else bad hurts you. (Yep, it happens!)

Here's where I'll explain what savvy buyers and sellers do before they sign NDAs, and then they periodically do it again : https://tinyurl.com/55nxhxzw