Form Input Not Working? Options

[Rayj00]

I have a form with 20 inputs. They all work except one.
By work I mean subsequently, a php script can read the $_POST
and update a mySQL database. But the following one is not
working, as the subsequent $_POST is empty?

For some reason the html looks like it's not working.

I have the following html:

<li id="li_15" >
<label class="description" for="element_15">Property Identification Number: </label>

<div>
<input id="element_15" class="myDiv" type="text" maxlength="30" name='propertypin' Required />
</div>
</li>

The subsequent $propertypin = ($_POST['propertypin']); echo ("\n<h2>Propertypin = $propertypin </h2>\n"); returns nothing,
while the other 19 $_POST's are fine.

This is pretty simple stuff but I am pulling my hair trying to fix it!!

Any ideas?

Thanks,

Ray