> >"<%@ Page Language="vb" AutoEventWireup="false"
> Codebehind="WebForm1.aspx.vb" Inherits="monacookdotcom.WebForm1" "

That will indicate that it was developed in ASP.NET using VB.NET

Normally you shouldn't see the source code (duh!) This line should be processed on the server and the result is what you would see on the browser.

It seems to me that the site was probably developed on ASP.NET on a machine that has ASP.NET but the server where it is hosted does not have ASP.NET and it is sending you the file as-is without processing on the server side. Although, if it looks OK in one browser but not in others then that would not be the case...