Did you notice that even the background for the entire practice board page used your background when you tested your code. That tends to verify my prior suspicion (first glance).
I noticed immediately that you have an HTML header, i.e. you're embeding a page within a page with these <HTML><HEAD> to start your code. I've seen that often cause problems with other templates. It's usually due to using an HTML editor (like Frontpage) to create the code (on the assumption the Template is a compete page by itself and it's meant to only be a frame within a page). I know this is jargon to you, but I hope that hint might help your coder look at the cause.
I'm going to port it to my editor for a better look and post back.