Hi Esteban,

I already inspected your site and it looks like some of the button are not are not using Bootstrap's classname standard for button.

I try to fix your site through FTP given, but failed to access by using information given.

Place this CSS code to this CSS file: /templates/jm-joomclassifieds/css/template.css, place it at the bottom of your source code for your future reference.

div#discuss-wrapper .btn { color: #333 !important; }

div#discuss-wrapper .btn.btn-primary,

div#discuss-wrapper .btn.btn-danger { color: #fff !important; }

Hope this will help, please advice, thank you.