Did these YDNA results originate with a descendant of another ancestor? DNA results (YDNA, MtDNA, and auDNA) are propagated overnight to all ancestors and and their descendants according to the rules of DNA inheritance.
e.g. A Gt Grandson of your Gt Gt Grandfather's brother took a YDNA test and entered it here. The YDNA is then propagated back up the Gt Grandson's male line to the brother and then across to your Gt Gt Grandfather and then down his male descendants.