Hi
Hope you are good
I have seen your issue in which your single checkout page do not load information.
#Do you have custom shipping gateway, which might creating issue? Or Disable shipping methods you don't use like Magento default installation has Fedex, USPS, UPS, DHL all enabled.
I will get more clarity once you give me access to cpanel and let me examine it thoroughly.
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Please Initiate chat so that I can suggest you better.
Regards