Items Reappear in Shopping Cart

I have a reproducible scenario that's quite odd.

1. I access the site, select product "A" and add it to my shopping cart.
2. I press Proceed to Checkout and login
3. I then logout.
4. I access another product "B" page and add it to my cart.
5. I press Proceed to Checkout and login
6. I ONLY see one product in my cart: product "B". product "A" doesn't show up.
7. I delete product "B" from my cart.
8. Now product "A" appears in my cart.

It seems to me that when I login the second time, I should see BOTH products "A" and "B" in my cart. If that's not the way the cart is designed, then at least product "A" shouldn't reappear after I delete product "B".

I appreciate any help you can give me with resolving this.

Thank you for the full explanation.

Is there a way to configure Hikashop to combine the previous carts with the current cart when a user returns? In this way, once the user returns and logs in after adding items to Cart B, items from Cart A also appear in the cart.

Excellent. How often do you release new versions? How will I find out when this feature makes it in?

Cool. Thanks for all of the help and details.