LIMIT_REACHED_REMOVED="Sorry this event has sold o

I have posted on this before but not sure what to do as a solution is needed.

If a user comes in and orders a item, and then gets distracted, they come back in and the item is no longer viewed by them. They try to re-order but the cart rejects them because there is already one item in the cart.

In order to recreate the issue,

Go here: www.wodrocket.com/index.php?option=com_h...ct&task=show&cid=535

Click "add to cart"

When it asks for login, please login using the UPPER LEFT (demo1/demo1234)

Then go back to the link again: www.wodrocket.com/index.php?option=com_h...ct&task=show&cid=535

and click "add to cart"

This is what will create this issue (screenshot).

The issue is with the login module at the top which doesn't redirect back to the checkout after the login.
So you think that you lost your cart, and try to add the product again in the cart, but you already have the product in the cart and thus you try to add a second product in the cart. However, you apparently have limitations to avoid a user to add more than one product in the cart and thus it displays that message and doesn't allow you to add the product again.
The normal Joomla login module redirects back to the same page by default. Isn't there a way to have a similar behavior for your login module ?