Okay thank you. I imported this database file and saw these SQL errors on import:
[ERROR in query 2791] Table 'studiogiochi_com_wflivetraffichuman' already exists
[ERROR in query 4519] Multiple primary key defined
I ignored those errors and continued my import. Then I installed the latest versions of WPML and Toolset plugins and activated the default Twenty Seventen theme. I went to the game archive URL here:
mytestsite.com/en/pubblicazione/game/
The results are the same as your live site. So I clicked "CERCA" without making any filter selections. The page reloaded, and I am now at this URL:
mytestsite.com/en/pubblicazione/game/?wpv_view_count=19465&wpv_sort_orderby=field-wpcf-pubblicazioni-anno&wpv-tipo=game&wpv-wpcf-pubblicazioni-anno=&wpv-pubblicazione-titolo=0&wpv-pubblicazione-autore=0&wpv-pubblicazione-editore=0&wpv_post_search=&wpv_filter_submit=CERCA
Again, the results are the same as your live site.
Next, I chose the option "Show only available options for each input" and tried the same tests. The game archive URL has the same results, but when I clicked "CERCA" I am shown an error message at the top of the page:
WordPress database error: [Unknown column 'wpml_translations.language_code' in 'where clause']
SELECT s.id, st.status, s.domain_name_context_md5 AS ctx , st.value AS translated, st.mo_string AS mo_string, s.value AS original, s.gettext_context FROM studiogiochi_com_icl_strings s LEFT JOIN studiogiochi_com_icl_string_translations st ON s.id=st.string_id AND st.language='en' AND s.language!='en' WHERE s.context = 'default' LIMIT 1000 OFFSET 5000
I'm not sure if this is a problem related to the two SQL errors, or if it's occurring on your live site as well. Can you tell me if the same error message appears in your live site's logs? If you are not familiar with error logs, I can show you how to activate them temporarily. Go in your wp-config.php file and look for
define('WP_DEBUG', false);
Change it to:
define('WP_DEBUG', true);
Then add these lines, just before it says 'stop editing here':
ini_set('log_errors',TRUE);
ini_set('error_reporting', E_ALL);
ini_set('error_log', dirname(__FILE__) . '/error_log.txt');
Then activate the option "Show only available options for each input" for this WordPress Archive. Go to the game archive page and click "CERCA". If the error is thrown on your site, this will create an error_log.txt file in your site's root directory. Please send me its contents. Once that is done, you can revert the changes you made to wp-config.php.