I have checked your site on my personal mobile as well and found no issue with the checkout page, cart page, or product page, all works fine as you can see in this video: https://streamable.com/uh2ezn if you see that I miss some steps then please make a video of the issue and share it and also, please share your site wp-admin URL and access in the private content area of this topic by following the below-given format
WORDPRESS ADMIN URL:
WORDPRESS ADMIN USERNAME:
WORDPRESS ADMIN PASSWORD:
So that I will check your issue on your site.
Note: Please take a complete backup of your site first.
Regards 8Themes Team.
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