Product Linking fault

Product Linking fault

Hi,
I'm experiencing problems with the products linking through the categories.
These products and category works fine: http://www.guitarworldcityarcade.com.au/index.php/store/electric-guitars and http://www.guitarworldcityarcade.com.au/index.php/store/electric-guitars/product/view/9/11
But when I add a new category and new product the link to the product doesn't work correctly. The new category I added is this: http://www.guitarworldcityarcade.com.au/index.php/store/amplifiers and the link to the product doesn't work. Although the product itself is fine. When I put it into 'electric guitars' for example the product links correctly.

I desperately need some help with this.

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Aw: Product Linking fault

Don't Worry,
It's to do entirely with how it links through the menu.
I have a suggestion though: Linking categories into the main menu of a joomla site should be easier, right now, all the different options are jumbled. Which is what happened with my shop.

Aw: Product Linking fault

Actually, now that I've made more links and menu items there are broken links everywhere and I have no Idea how to fix them. Someone help. You can see the problems by navigating through the products on the site: http://www.guitarworldcityarcade.com.au/
Pleas disregard the major styling flaws at this point.

Aw: Product Linking fault

error?