Disappeared Menu Items

The template I have is Coffe. I've been working on setting up the main nav menu this evening and I had several set up as well as child menu items for a couple as well. They were all working fine until I went to the template manager and tried to see what I could do with the template sizing.

I went from 980 to 1000px and saved it. When I went back all the main menu items I created were gone and replaced with stuff like "Getting Started", "The Joomla Project", etc., which were all titles of sample articles that came with the template. I deleted all sample articles, but it's still there. What happened to the menu items I created and why is the menu pulling in sample articles into the navigation area?

Also, why can't I delete some of the main menu items like "Sample Sites" and "Site Maps" along with their child menu items?

I'd appreciate any help anyone can offer.

Hi
Can you give me access to your site? Please send it to [email protected]. Did you install quickstart package ?