Problem with translation menu

Hi, I’ve a website in local environment that use Polylang. I’ve registered and translated every string and it works. I’ve also recreated the website on an hosted environment (online) and I’ve a problem. When I open the “Translation” menu and apply changes on translated string it gives me the same italian translation in both language on the menu.

I’ve this translation setting in functions.php. The theme is custom. I also have the plugin CF7 and Multilingual Contact Form 7 with Polylang installed but also if I deactivate the plugin the translation continues to not work.

if(function_exists(‘pll_register_string’)) {

        pll_register_string(‘string’, “translation”, ‘group’, false);

}

Please can someone help me? Sorry for my bad english.