@KaneshiAkai Have you tried reinstalling browser and clearing the cache, if it's working fine with chrome then there must be issue with opera but on my side it's working fine install a fresh copy then check the issue if it's resolved or not and are you using the latest version of opera?
@MauroCananzi On my side, Disqus comments are working fine with Opera GX. I suggest you try clearing your browser cache and then check again. That might resolve the issue.