We have prolem with cart checkout - after checkout, the order is made, but no change in the cart (product remains there) and redirect client to checkout page w/o clients greeting etc .. All https, compressions was removed and same ..
Please upgrade EShop to latest version 2.5.3 and check again. If you have still have the issue, please submit a new ticket to send me the super admin account to your site so I can help you to check and resolve the problem.