Datatable return same values in different pages

[starking8b]

I am working on a project using Laravel with Mongo DB , this is my transformer

<?php


namespace App\Datatables;

use League\Fractal;
use App\Models\Device;
use Carbon\Carbon;
class DeviceTransformer extends Fractal\TransformerAbstract
{
public function transform(Device $device)
{
    $online='<a ><span class="avatar">  <span class="avatar-status-offline"></span>    </span>offline</a>';
        $vlan= $device->InternetGatewayDevice['WANDevice']['1']['WANConnectionDevice']['1']['WANPPPConnection']['1']['X_HW_VLAN']['_value']??"";
        $mac=$device->VirtualParameters['Macaddress']['_value']??"";
        $pppoeUsername=$device->VirtualParameters['pppoeUsername']['_value']??"";
        $rxpower=$device->VirtualParameters['RXPower']['_value']??"";
        $ssid=$device->InternetGatewayDevice['LANDevice']['1']['WLANConfiguration']['1']['SSID']['_value']??"";
        $lastinform=$device->_lastInform ??"";
        $lastinform=Carbon::parse($lastinform)->format('Y-m-d H:i:s');

        $now=Carbon::now()->subMinutes(5);
        $last24hours=Carbon::now()->subHours(24);
          if($lastinform> $now)
              $online='<a><span class="avatar"> <span class="avatar-status-online"></span>   </span>Online</a>';
          elseif($lastinform<$now && $lastinform > $last24hours)
              $online='<a><span class="avatar"> <span class="avatar-status-busy"></span>  </span>Past 24 Hours</a>';


return [
'id'   => $device->_id,
'serial'=>$device->_deviceId['_SerialNumber'],
'productclass'=>$device->_deviceId['_ProductClass'],
'vendor'=>$device->_deviceId['_Manufacturer'],
'lastInform'=> $lastinform,
'vlan' => $vlan."",
'Mac'=>$mac,
'PPPusername'=>$pppoeUsername,
'RX'=>$rxpower,
'ssid'=>$ssid,
'action'=> "<a href='".$device->_id."'>Show</a>",
'online'=>$online
];
}

}

this is how I call data in the controller

$data=Device::query();


 return DataTables::of($data)
      ->setTransformer('App\Datatables\DeviceTransformer')

      ->make(true);

the problem is after 3 or 4 pages same raws comming to data table , and just 2 or 3 raws change. how is that Possible, it seems datatable return same raws again and again in different pages .