I am seeing two sets listed of the Abandoned, Steam Fanatic's, and Castle Mandrake sets listed in the following pages:
http://dotd.wikia.com/wiki/Category:Bonus_vs_Constructs
http://dotd.wikia.com/wiki/Category:Bonus_vs_Human
http://dotd.wikia.com/wiki/Category:Bonus_vs_Sieges
Not sure how to remove them myself and there may be more items listed twice in other catagories.