Order page adds item to wrong line item on cart page

Hi We're having a problem with eCart adding different items to the same line item in the cart?

We've built a cart that enters first product correctly, then 2nd item purchased is added to the 1st item qty but no name or description is added on a second line.

After continue shopping is clicked the 3rd item purchased will be created (added to the cart) on a 2nd line - but it must be a different item.

Last issue is:
on the LUNCH section of the catering link we have a Sandwich platter item and an add to cart button with 8 check boxes below. We would like to have all of the check box data listed in the cart when a sandwich platter is ordered. The check boxes have no dollar value they are just a sandwich selection checkbox.

I've attached the files to this thread

Thanks

Jackie