I was doing a descendant sort on Tabitha Jayne (http://www.geni.com/people/Tabitha-Jayne/6000000001735893107), restricting the list to "Public" and "Photo". It came up with some really erroneous listings. For example, it listed "William Norton" as "Tabitha's 10th great grandson", when in reality he is her 4th great grandfather (http://www.geni.com/path/Tabitha+Jayne+is+related+to+William+Norton?from=6000000018427145399&to=6000000003277819079). That sort lists many other people as being her descendants who were born long before her. Additionally, it lists some people as being her 13th, 14th, 15th, and 16th great grandchildren who were born before or just after her.
I often look at the descendants listings and have never seen this problem before.