Laravel - Problem Of How To Tune Strange Behavior With Sending Text Message

I have a very special problem and I don't know how to deal with it.

I have web App in Laravel, when i open index page, I receive text message to my mobile phone. Problem is, sometimes I receive 2 messages or 3, sometimes 1. Is there a tool how to debug this strange behavior which is not always the same?

A few words about my code: user opens the page, and because its first visit Session doesn't have attribute message_sent and SendTextMessage::SendMessage($phoneNumber, $id_message, $smsCode, $newDateFormat); is executed. After that Session has message_sent and can't be sent again, for example if I refresh the page.

SendTextMessage::SendMessage() is Class in Laravel Helpers.

controller code:

public function index($url_attribute, $id_message, Request $request)
{      
    if(!Session::has('message_sent'))
    {
        $user = User::where('id_message', $id_message)->first()->toArray();
        $phoneNumber = $user['mobile_phone'];
        $smsCode = $user['sms_code'];
        $newDateFormat = date("d.m.yy", strtotime($smsExpirationTime));

        $request->session()->flash('message', 'Text message sended.' );

        SendTextMessage::SendMessage($phoneNumber,$id_message, $smsCode, $newDateFormat);
        Session::put('message_sent', true);

    }

    return view('login');
    
}

SendTextMessage Class:

class SendTextMessage 
{
    public static function SendMessage($phoneNumber, $id_message, $smsCode, $newDateFormat)
    {
        $sms = new Connect();
        $sms->Create("user","pass",Connect::AUTH_PLAIN);
        $sms->Send_SMS($phoneNumber,"Message");
        $sms->Logout();
    }
}

Many thanks for any tip or help.

UPDATE:

problem is only in Chrome. Edge and internet explorer are fine.