Site shows empty page with ?z in the URI

[schembrowser]

My website URL is:
http://schembrowser.epizy.com

What I’m seeing is:
Empty page on some connecitons. I tried clearing cache and opening private windows. But empty page keeps showing occasionally.
If it shows it never goes away, so it will block some viewers from visiting the site.

I’m using this software:
Firefox 73

Additional information:
Website is newly created, will the problems go away on their own?

[Ergastolator1]

https://infinityfree.net/support/why-doesnt-my-domain-work/

[schembrowser]

Thanks, i didn’t see that because the site was working already, just occasionally not.