Why is the mail notification sent multiple times?

Question

1C-Bitrix

<?global $USER;
    if ($USER->IsAuthorized()){?>
       <?
        $rsUser = CUser::GetByID($USER->GetID());
        $arUser = $rsUser->Fetch();
        $arUser["UF_MOBILE_NUMBER"];
        $arEventFields = array(
        'Z_NAME' => $USER->GetFullName(),
        'Z_PHONE' => $USER->GetEmail(),
        'Z_MAIL' => $arUser["UF_MOBILE_NUMBER"],
        );
        CEvent::Send("NEW_USER_REGISTRATION", SITE_ID, $arEventFields);?>

Answer 1

Settings-Tools-SQL-query and execute the following query:
select * from b_event where event_name like '%NEW_USER_REGISTRATION%' order by date_insert desc
Look at how many times your event is processed, see if the event includes several mail templates