it says Yitskhok Yofe was born in 1730. his father's father's father etc, going back only 9 generations, is shown to be Rabbi Shmuel Samuel Marx Jaffe (of Dampierre), who must have been born before 1184 as his father (Elkhanan HaKadosh Tosaphist Joffe of Dampierre, The Martyr, הי״ד) died in that year. That is 9 generations for a span of at least 546 years, which is an average of ~60 yrs per gen, which doesn't make sense. what went wrong here.
