Fields not being Posted by web form

Fields not being Posted by web form

We created a webform using a third party tool (Joomla, RSForms and their Zoho extension).  When we submit data on the form through POST most of it comes through just fine but some fields are missing.  These fields are entered perfectly into our database but don't get posted to the Zoho lead. For example we have a script that captures the IP address of the submitter. This comes through just fine as a text field.  We also have one that captures both their current URL (of the form on the web site) as well as the last URL they visited (the referring URL). These are missing in Zoho when the lead is created (or updated).  I tried using both built in fields (i.e. URL) and custom fields to no avail.  

I attached the POST data I recorded in Chrome. This shows the data is there. The Joomla database records it correctly, Zoho does not.   This is an example form showing the fields in place:
https://www.ufcinc.com/index.php?option=com_rsform&formId=38

We did a live chat on this yesterday and Zoho is investigating.  Has anyone had this issue?