Hi mellxx,

Thank you for letting us know, we'll check and fix it as soon as possible. 

This is already fixed in next version.

Please do this change in core file if you need to fix it as soon as possible. Install WP Editor plugin (please don't use WordPress native plugin editor). Navigate to Dashboard > Plugins > Editor. Select wpForo plugin. open the Find and open the /wpforo/wpf-includes/wpf-actions.php file. And find this code (line 472):

foreach($_POST['wpforo_member_options']['default_title']['rating'] as $key => $subArray){
       $_POST['wpforo_member_options']['default_title']['rating'][$key] = array_map('sanitize_text_field', $subArray);
}

Change it to this:

foreach($_POST['wpforo_member_options']['rating'] as $key => $rating){
       $_POST['wpforo_member_options']['rating'][$key] = array_map('sanitize_text_field', $rating);
       $_POST['wpforo_member_options']['rating'][$key]['points'] = intval($rating['points']);
}

And save it. then deactivate and delete the WP Editor plugin, if you don't need it anymore.