I've implemented several custom fields such as Address using the approach from EPiServer.Forms.Samples.  This custom field has multiple input boxes for street, city, post code etc.  I then set the values into a class and then convert to json. This has always worked great, until I tried adding to our layout the Client resource scripts for header and footer.    Without the client resource scripts we always had a javascript error of epi is undefined, but it never affected anything so was ok with it.  

The address model field has:

public class Address : InputElementBlockBase, IElementCustomFormatValue

When this bit runs on the submitting form:

public override object GetSubmittedValue()
        {
            var rawSubmittedData = HttpContext.Current.Request.Form;

            string[] addressComponents = rawSubmittedData.GetValues(this.Content.GetElementName());

it only ever has 1 component which is the first input box.

When I run the same code without the client resource header/footer scripts, the code will have my 7 components I am expecting.  Is there a change I need to do to make it work with the client resource scripts?