Unwanted White space b/w header and contents on my site

I am facing an issue with my site on Brave Browser, on first load a white space is showing between header and contents. any expert can help.
i am attaching the site link.
Apk Medley

Even in Chrome (Incognito mode), the site flashes. Then doesn’t show the icons. Is it related to the cms or is it misconfigured?

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