You have css minify enabled on your plugin which is causing your issue. Caching plugins, if not configured correctly, may cause a lot of issues and would be better off disabled.
Is annoying because the website does not show properly. If I don’t resolve this I need to change the theme.
I run multiple websites that use this theme and none of them have this problem of yours. I use a page caching plugin on all of them so it leads me to believe that your plugin is simply setup incorrectly.
You can always use a different theme if you find that more convenient.