Genderfluid doesn't have to mean fluidity strictly between male and female. It can mean fluidity between multiple genders-- whatever those genders might be. Genderqueer, to me, means non-binary and implies consistency.
I will also say though, that both are and identity-- not a presentation. Being genderqueer or genderfluid is not about rejecting gender roles, but about identifying as non-binary and/or fluid. Gender roles are not the same as gender.
Example: a woman may shave her head, wear clothing from the "men's" section of a clothing store, and may go into construction work. She is rejecting the traditional, stereotypically feminine, "woman's role." She still thinks of herself as a woman. Therefore, she is a woman. A man may decide to provide primary care for children, wear perfume or nail polish, and watch romance movies. He is rejecting the traditional, stereotypically masculine, "man's role," but he still thinks of himself as a man. He is still a man, because he identifies as a man.
Summary: Genderqueer is a nonbinary gender that may be consistent. Genderfluid is a non-binary gender that includes multiple genders. Gender and gender roles are not the same thing. Gender is determined by identity, not behavior.