Magento 1.9 issue

Hi there, I am facing an issue with my magento website. With this website – the one-page-checkout works upto selection of payment method and then redirects to cart again. No order gets completed. We have checked all backend settings. After that, via FTP we reinstalled many of the original files. Still no success. This problem might be because of a patch, but we cannot say for sure. I have looked at other forums but no help. Kindly do help me out if you have faced this issue or know about it.

submitted by /u/zriy
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