Multiple Lines of Descention

Has anyone else find they are descendant of certain persons a few times over? Example- I am descendant of Edward the 1st thru 2 daughters( one of them Joan of Acre twice by 2 of her daughters) and Edward the 2nd. It get a little confusing til I see direct path of relation. I know that the royals married each other to keep blood line and make alliances but geesh! :)

Prince Charles is descended in 99 different ways from William the Silent, and thousands of ways from charlemagne. it is called ancestral collapse. you have more ancestors living 1000 years ago then there were people in the world so they start doubling up

Thanks. I had not heard the term Ancestral Collapse.