Sorry to dig up an old thread, but I just ran into this same problem, where the Page_Load event of a module was being called twice. The cause for me was a line in Chris' original module template (for VS 2010):

private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load); // HERE
}

Commenting that line out removed one call to the module's Page_Load routine. I'm not sure why that line is in there, its seems to just cause the load event to fire twice. I peeked through the VS2012 template code and I don't see a similar line in there (We don't have VS2012 yet, so are still using the 2010 version).

Leaving this here for future Googlers of this issue and hopefully a response.

Thanks.