If I am logged out and entering email and name, the post is just disregarded and not being entered and also not going for moderation

Please leave the forum URL where this issue occurs. 

If I am logged out and entering email and name, the post is just disregarded and not being entered and also not going for moderation

// I have commented the entire section to have the forum enter posts because Gtranslate have differet HTTP_REFERER for each post
// if( $mode == 'ref' || $mode == 'full'){
//
// if( !isset($_SERVER) || !$_SERVER ) {
//
// //exit('Error 2252 | Please contact to forum admin.');
//
// }
//
// $ref = $_SERVER;
//
// $url = get_bloginfo('url');
//
// $ref_domain = trim(strtolower(parse_url($ref, PHP_URL_HOST)));
//
// $web_domain = trim(strtolower(parse_url($url, PHP_URL_HOST)));
//
// if( $ref_domain != $web_domain ){
//
// //exit('Error 2253 | Please contact to forum admin.');
//
// }
//
// }

I am using Gtranslate plugin that has a different subdomain per each language

The above fix made the error disappear but that doesnt help because the topic was not saved into the forum - the page just redirected to itself

And then there s another error - 

Failed to load plugin: wpforo_spoiler_button from url https://www.forumrealestateusa.com/wp-includes/js/tinymce/plugins/wpforo_spoiler_button/plugin.min.js

Why the plugin doesnt use relative links instead of absolute ones?

The domain www.forumrealestateusa.com is not a real domain but the english version of the site

Is there a way to set a constant HTTP_REFERER of the original domain?

Which then creates this conflict, as the site I am working on has the staging1.url structure (and the SG setup does not have the 'staging1' part).

The workaround Robert mentioned above resolves this issue on the staging site.

My site is hosted through siteground and I don't have any issues at all as long as I have the two pages set as per installation instructions:

I did have this same problem upon initial installation but this was due to a miss match of URL's

Is your staging URL currently different from your site URL by any chance as I think this would cause similar issues.

I hope this helps.

This worked, thanks!

I'm looking forward to testing wpForo. I found out about you guys over on the PeepSo forum. Hoping to see if they can place nice together. 

Have a great day.

/wp-content/plugins/wpforo/wpf-includes/functions.php

Find this part of code:

if( $mode == 'ref' || $mode == 'full'){
   if( !isset($_SERVER) || !$_SERVER ) {
       exit('Error 2252 | Please contact to forum admin.');
    }
    $ref = $_SERVER;
    $url = get_bloginfo('url');
    $ref_domain = trim(strtolower(parse_url($ref, PHP_URL_HOST)));
    $web_domain = trim(strtolower(parse_url($url, PHP_URL_HOST)));
    if( $ref_domain != $web_domain ){
       exit('Error 2253 | Please contact to forum admin.');
    }
 }

Add "//" comment on front of the red marked lines.

if( $mode == 'ref' || $mode == 'full'){
   if( !isset($_SERVER) || !$_SERVER ) {
      //exit('Error 2252 | Please contact to forum admin.');
   }
   $ref = $_SERVER;
   $url = get_bloginfo('url');
   $ref_domain = trim(strtolower(parse_url($ref, PHP_URL_HOST)));
   $web_domain = trim(strtolower(parse_url($url, PHP_URL_HOST)));
   if( $ref_domain != $web_domain ){
       //exit('Error 2253 | Please contact to forum admin.');
   }
}