User blog comment:Powerhouse411/Devil Fruit Contest/@comment-24070327-20140720015624

Inushima-sama. You can only nominate one type of Devil Fruit until after you've nominated six Devil Fruits. It can be one of each type, one of two types, or just one Devil Fruit.

You just can't vote in more than one of each type until AFTER you've voted in six Devil Fruits.

This is intended to prevent the contest from being flooded with just Paramecia or Just Zoan or Just Logia. I want to give Devil Fruits of all types an equal chance of being the winner.