Hello, @Coroveisc,
Actually, the issue is in the attributes you created on your site. That’s why the other does not appear. If the theme has any issues then the brand and price filter will also not appear. I also, test the issue by creating new attributes and it works fine. I have captured a detailed video for you please watch it complete: https://streamable.com/34y8g3
So now you have to create attributes again and remove all the old from your site completely. I hope your issue will be resolved.
Regards 8Themes Team.