bbPress.org

Yes, a user signs up through memberpress, which creates a username record in wp_user. Then, for whatever reason, instead of the nicename or whatever in the wp_bp_xprofile_data table, those users are labeled as imported_nicename, and that’s what is visible on bbpress. If a user goes to change their username, it apparently fixes the issue. But I’m operating on a dozen or more signups a day, and over 7k users.