It does not show the sql query with some

I have this code in php to show the entered data, it just shows some not all, what is event_id , event_description and value which are the fields in the BD shows them correctly, but data such as title_event does not show them.

<?php
  include "conexion.php";
  $data=array();
  $q=mysqli_query($con,"select valor from 'Evento'");
  while ($row=mysqli_fetch_object($q)){
    $data[]=$row;
  }
  echo json_encode($data);
?>

These are the data of the BD