Images not updating after move hosting

Hi, after I moved my website from a hosting server to another one (to Siteground.com), Images from my feed stops to fetch and they are visible but not updates.
I’m with W3Total Cache optimized for Woocommerce, plugin 2.0.3 with those customizations (with or without doesn’t work too):

//FOR WP-instagram-widget, get only images from feed
add_filter(‘wpiw_images_only’, ‘__return_true’);

add_filter(‘null_instagram_cache_time’, ‘my_cache_time’);

function my_cache_time() {
return 3600;
}

Thank you, Luca

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