Human heroes keep getting duelist trait

[Warduke]

Been playing exclusively toads and swapped to humans to try them and saw on over 10 maps(i restart a lot) that i almost always get duelist heroes. Toads were getting a variety of trairs in contrast. Anyone rlse noticed? Could it be race type affects traits?
I am playing a lot of feufal and industrious as well but again as toads duelist was rare.