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From SNPedia
Magnitude 7
Summary Data Quality issue. Your data provider is reporting heterozygosity on the Y chromosome.
Criteria Gs300/criteria

This genoset is being phased out, and consolidated with gs266

It is extremely unlikely that you actually have multiple Y chromosomes, and usually reflects a lack of quality control in your raw data. This is not uncommon for Ancestry.com. For more information see their comments at http://ancestryforums.custhelp.com/posts/b7de792b84?commentId=30021