BuddyPress.org

@jesperpopma

Your avatar URLs appear to be missing the leading “http:”. I think I remember reading about this bug before.

You can temporarily fix this by defining your BP_CUSTOM_URL in wp-config.php to:
define( 'BP_AVATAR_URL', 'http://nijmegeneet.nl/club/wp-content/uploads' );

See if that works.