I try 3 iPhone but it still the same. I am not sure which one is wrong under my WordPress setting, please you advise.?
I try a lot but not sure which one I have to check.
Your website should be https not http by using SSL.
You can use free ssl from cloudflare then install cloudflare plugin (Flexible SSL for CloudFlare) in WordPress.
After I open your demo website on my iPhone, it shows correctly as attached file (https://prnt.sc/12mm4fv).
Please you advise. Thank you for your support.