i did web site using ssl certificates form let's encrypt.
i also included your iframe to show our servers.
The problem is that the picture is not visible for this reason :


Invalid SSL certificate

The origin web server does not have a valid SSL certificate.

Ray ID: 3706247e294a1049
Your IP address: xx.xx.xx.xx
Error reference number: 526
Cloudflare Location: Paris

Any help ?

Cheers

Gametracker does not fully support https


There is some advice that may help you here;
http://www.gametracker.com/forums/forum.php?site=1&thread=129417


Specifically
burn wrote:

Change the embed code to cache.gametracker.com instead of cache.www.gametracker.com and see if that helps.


You may also wish to add your name to the list requesting enhancement here;
http://www.gametracker.com/forums/forum.php?site=1&thread=92017