This is my first post on this community. I have a project that Ive had some developers help me with. One of the extensions I installed is Mageplaza One Page Checkout. In one of my sites when I go and view and edit part of the cart it takes me to the shopping cart summary where I can edit and view what I have on the cart. As you can see from the screen shot the calculations are wrong. I've contacted the developer (Mageplaza) and they said they tried it with the default checkout in magento and it gives them the wrong calculations (totals) as well. Another problem I have is when I click on go to checkout the check out page never fully loads. Any one else had this issue with the calculations or the page not loading?