sticky header problem

Hello while randomly browsing the sticky header menu, it turns black. Then I refresh the page and it returns to the correct color.
I attach a screenshot of the malfunction.

How can I solve it?

https://prnt.sc/SHkVvIaUtRL_

Hello,

Sometimes, your browser might be showing you a cached version of the page. Clear your browser cache or try accessing the page in incognito/private mode to see if the changes appear.

Best Regards.

[Author]

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