Hi Alexander,
I am sorry for the delayed reply.

we are not doing anything special to exclude any field.

here is the code that we are using to create the fields list in the dropdown.

	static $profile_fields = array();

	if ( ! empty( $profile_fields ) ) {
		return $profile_fields;
	}

	$groups = bp_xprofile_get_groups(
		array(
			'hide_empty_groups' => true,
			'fetch_fields'      => true,
		)
	);

	foreach ( $groups as $group ) {
		foreach ( $group->fields as $field ) {
			$profile_fields[ $field->id ] = $field->name;
		}
	}

	return $profile_fields;

Please contact WBCOM and ask them if they are excluding their fields from non edit/signup pages. It is quite possible that their plugin is excluding some fields on non signup/edit profile screens.

Regards
Brajesh