Categories do not show items

I have got a weird problem with my site.

When you click on any categories which have products in there do not open.

I have to click on NEW PRODUCTS button to view the items. Then when you click on ADD TO CART, nothing comes up on page.

Can someone help me as i am new to zencart and just trying to learn.

You appear to have one product each in your clearance and keyboard/mice categories, and none in the others. Your all products link shows only those two products.

What makes you believe you have more products than that, and what behavior are you expecting and not seeing?

Problem is now sorted after i overwrote the files with original ones.

Thanks for sharing comments anyways... :)