It’s called a flash of unstyled content (FOUC, also flash of unstyled text or FOUT) which is an instance where a web page appears briefly with the browser’s default styles prior to loading an external CSS stylesheet, due to the web browser engine rendering the page before all information is retrieved.
It could be caused by many things. bad scripting, server delay, bad coding, etc.
You could check out a site speed test (google “pingdom site test”) and it MAY give you a clue.
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