I do have unique ID's.
Go to www.UltraAirVent.com and select the purchase page. Add different types to the cart each time you get to the cart hit the continue shopping to add the next item.
Then while on the cart page with several items, click on a remove check box somewhere below the first item. When you click the Update button you will see that all the items above the box checked are ok, but the items below where the box was checked all get removed.
I suspect this has something to do with repeat region.
This is something that used to work on Ecart 4 with .ASP