Text dropped after whitespace using mysqli_query

I am using a mysqli_query to insert text into a VARCHAR field field any any words after the whitespace are dropped when I pull from the database. I modified the field to be TEXT or BLOB and the same thing happens. I am not sure if it the text is being trimmed out when going into the database or coming out. Unfortunately, I cannot see the data in the database besides doing a query  because we do not have anything like myPHP Admin. Any thoughts code below. 

$sql="UPDATE date_tbl SET dt_startDate='$_POST[dt_startDate]', dt_endDate='$_POST[dt_endDate]', dt_headline='$_POST[dt_headline]', dt_text='$my_text', dt_tag='$_POST[dt_tag]', dt_media='$_POST[dt_media]', dt_thumbnail='$_POST[dt_thumbnail]', dt_credit='$_POST[dt_credit]', dt_caption='$_POST[dt_caption]' WHERE dt_id ='$_POST[dt_id]'";


if (!mysqli_query($con,$sql))
  {
  die('Error: ' . mysqli_error());
  }

echo "$my_text"; 
echo "1 record updated";

mysqli_close($con);