The name displayed in the canvas is the formatname field. You have it on the "User Information" tab, but that tab is unpublished so it can't display the formatname. You have the same issue with the avatar field being on the unpublished "Pasfoto" tab so it can't display either.
You also have the following error.
Code:
Column 'username' in order clause is ambiguous SQL=SELECT DISTINCT ue.*, u.*, '' AS 'NA' FROM #__users u JOIN #__user_usergroup_map g ON g.`user_id` = u.`id` JOIN #__comprofiler ue ON ue.`id` = u.`id` WHERE u.block = 0 AND ue.banned = 0 AND ue.approved = 1 AND ue.confirmed = 1 AND g.group_id IN (8, 2, 9) ORDER BY `username` ASC LIMIT 0, 50
For some reason the "username" column exists in your _comprofiler table and it should not. That should only exist in _users and you'll need to manually remove that column in _comprofiler database table. Looks like you've the same issue with "name" as well.
One of your profile tabs also appears to have broken HTML so your profile page HTML is being distorted. It appears the HTML is coming from Bijeenkomsten tab, but could be one of your tab or field titles that you've HTML in.