WCF response has some extra charactors

I wrote a WCF service that when I test it with SOAP UI I get this response:
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"> <s:Body> <ProcessXMLResponse xmlns="https://cfchub.c.com"> <ProcessXMLResult xmlns:i="http://www.w3.org/2001/XMLSchema-instance"> <StatusCode>201</StatusCode> <StatusDescription>XML Validation Fails</StatusDescription> <comments xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays"> <a:string/> <a:string>The element 'Collateral' in namespace 'https://cfchub.c.com' has invalid child element 'VIN' in namespace 'https://cfchub.c.com'. List of possible elements expected: 'Vehicle' in namespace 'https://cfchub.c.com'.</a:string> <a:string>The 'https://cfchub.c.com:DealerId' el ...