Ancestry.com is known to report one of the ApoE-SNPs wrongly. I wouldn't be surprised if this happens for more rare genes as well.
> Word of caution to those with data from Ancestry.com: in our experience, based on data in OpenSNP and from Promethease users since 2006, Ancestry data always reports rs429358 as (T;T), even for people who's data from other sources indicates they are (C;T).
> Word of caution to those with data from Ancestry.com: in our experience, based on data in OpenSNP and from Promethease users since 2006, Ancestry data always reports rs429358 as (T;T), even for people who's data from other sources indicates they are (C;T).
https://www.snpedia.com/index.php/APOE