IXMLDOMElement Vs. IXMLDOMNode???

I'm trying to use the "Microsoft.XMLDOM" object in ASP, both are running windows 2000 and here is my problem.
I have a test server where I am creating an XML object and running some functions. What these functions do aren't all that important. But i do use the the xml.selectSingleNode() function. On my local server, the type of the returned Object is "IXMLDOMElement". However, when I do this on my server, the type is "IXMLDOMNode". Are these using different dom document versions? If so how can I streamline these and make sure that the same object is being created on both servers. I aslo have trouble doing transformations (via XSL) on the server. Why is there this discrepency.