Html txt popping up on page load before rendering

http://www.cloudy2clearwindows.co.uk/

Hi, I am having a problem with the HTML code popping up visually on page load on most pages before the page renders. Usually this was caused by the caching plugin but i tested it by turning off WP fastest Cache and trying again but the the problem persisted. Could you take look for me? I have opened up the back of the site for you.

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