I've just discovered a fairly major flaw in my checkout implementation and I'm hoping someone can point me in the right direction.
The site is http://www.babblebib.com/
My checkout template includes a 'view cart' link as part of the template. This loads the standard (but visually customized) colorbox cart. On my site you can get this by clicking the '1 items' link in the top right (or however many items you added to your cart).
My problem is that if i view my cart from the checkout page and update something in my cart (edit quantities or add a coupon), the order totals shown in my checkout page are not updated. This is obviously a fairly big issue if someone makes a lot of changes or adds a coupon and checks out without double-checking.
How can i make sure that cart edits on my checkout page are reflected in the checkout page when i click 'update cart' in the view cart pop-up?
I'm using the 'multiple flat rate shipping' customization but i do not think that will matter?