This is an accepted solution.
Ted here from Shopify, thanks for posting your query!
I can confirm that I was able to go through the checkout process successfully. I could see accurate shipping rates and I had the option to pay for the order with Paypal or a direct gateway. I experienced no issues with the gateways either. Are you seeing any errors?
I would recommend moving the "Chat with us" button you have at the bottom right, to the left side of the page instead as it's blocking the checkout button as shown in the below screenshot.
In addition, the storefront page is quite long. Would you consider moving some information to another page? For example, you could create a new tab in your menu called "Product info" and link three new pages with PDF downloads, Youtube links and reviews.
Let me know what you think! If there is anything else I can help you with, please let me know, I'm happy to help.