Problem with sticky menu

Hi, I have this issue in my website ilnocedoro.it: when I scroll down the page, sticky menu appears, but sometimes a black background appears briefly.

Sometimes you have to scroll up and down several times before that happens, sometimes it happens as soon as you scroll. I can't do a screenshot and the development tool in my browser is useless in this case, as I think it's a javascript effect. Anyway it's a bit annoying. Can you please help?

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