%username% shortcode in link going to wrong user name

Hi,
I have a link going to http://www.fithappensla.com/gauntlet/members/%username%/groups/my-groups

I have a user "Brooke" who, when she clicks on it, it goes to the wrong username. I'm not sure why. The user name the link is going to is using is her first & last name. I've checked under "Users" and under "Members" (in Membership) and, in both places, her user name is "brooke"

Not sure why or what's going on. You guys have access, by the way, for another issue... if you need it.