Обновить WordPress.
И плагины: Advanced Custom Fields, Contact Form 7, Custom Permalinks, Cyr to Lat enhanced, Duplicator, Inline Related Posts, Meta Keywords Generator, PB SEO Friendly Images, PDF Embedder, Really Simple SSL, Search Regex, Simple Custom Post Order, Simple Sitemap, TinyMCE Advanced, Webcraftic Clearfy, Webcraftic Robin image optimizer, Webcraftic, WP Fastest Cache, Yet Another Related Posts Plugin, Yoast SEO.
После протестировать все на корректность работы и отображения.