It appears as if the CSS that Page Builder requires is not being outputted in the header. The most most likely reason for this that there isn’t a wp_head() call in your theme’s header.
I see the name of your theme, Alea, is the same as the name of the site. I assume this means it’s custom coded? If possible, could you check that there’s something that looks like this in your header.php file. If it’s not there, can you add it?
<?php wp_head() ?>
This should go right before the closing </head>
tag in your themes header.