Hey,
Able to reproduce this on the demo,
The following code looks weird to me. We should probably adjust the archived check
github.com/itflow-org/itflow/blob/master/trip_edit_modal.php:-
$sql_users = mysqli_query($mysqli, "SELECT users.user_id, user_name FROM users
LEFT JOIN user_settings on users.user_id = user_settings.user_id
WHERE user_role > 1AND user_archived_at > '$trip_created_at'ORDER BY user_name ASC"
);