AspNetCompiler, including files that are not in my project

I use msbuild to automatically build and package a site ready for deployment. When I compile and then publish my project through Visual Studio 2008, everything works fine.

However, when I use msbuild, I get errors because AspNetCompiler tries to compile aspx and ascx files that are not included in my .csproj but still exist in version control.

I know that I can just remove them from version control, but can someone tell me why these files are compiling?

Here is my msbuild task.

    <AspNetCompiler                
     TargetPath="$(PackageDir)\Web"
     VirtualPath="/"
     PhysicalPath="$(buildDirectory)\Web"
     Force="true"
     />

Thank!