Проблема со вставкой скриптов на Вордпрес

Появилась проблема на Ворпрессе (версия 4.9.8) При написании текста в визуальном редакторе требуется иногда вставить скрипт, например вот такого вида:

<script src="https://c11.travelpayouts.com/content?promo_id=1499&shmarker=38580&wtype=context&order=top&num=3&widget_template=horizontal&width=100%25&logo=true&widgetbar=false&powered_by=false" charset="utf-8" async></script>

Для этого я перехожу в редактор "ТЕКСT" и вставляю этот скрипт.

При переходе обратно в визуальный редактор теряется половина текста в неизвестном направлении и вместо вставленного скрипта появляется значок неисправного файла.

Если перейти обратно в "ТЕКСТ" то уже вместо вставленного скрипта появляется вот такое:

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