Your site is using some kind of <iframe> redirect service to your IP address on port 8787. This is not compatible with Let's Encrypts http-01 challenge type, which is used by the --apache plugin.
It looks like your port 80 on the IP address 217.180.227.12 is working too? So why not update your ddns DNS to point directly to your IP address and just use port 80? That would at least be compatible with Let's Encrypts http-01 challenge. And those <iframe> things are really not the best thing to implement anyway, especially if there's not a good reason to do so.