Hello I am having the same problem, I know it is something I have done, but have been trying to trouble shoot without success.
I am running Joomla 3.4.3 and HS Starter 2.5.0. The mini shopping cart shows the order but does not have a proceed to checkout link so the customer is stuck. As this is a live site, and our customers typically order one product at a time, I temporarily have the Add to cart button link directly to the checkout page. The site is bestsquashracquets.com
Please help. I am also requesting support from the template designer, using the Gavick Strorefront template.
Thanks,
M