Category 404 error

Hello,
I have a problem (some) of my categories linked from the main menu give 404 errors:
https://greekbox.pl/grecka-oliwa-z-oliwek/
https://greekbox.pl/greckie-oliwki/

another two work fine:
https://greekbox.pl/ocet-balsamiczny
/https://greekbox.pl/greckie-ziola/

But when you click the problematic categories not from the main menu but from the menu under category title on the shop/category page everything works fine. 
https://snipboard.io/OBY7G2.jpg

I checked the redirects but nothing was found there. 
Can you please help me to solve this?Best regards!Chris

Hello,

Now I have checked the categories and there is no 404 error.
Screenshot for clarification:
https://snipboard.io/uJn9vd.jpg

Check back your site after completely clearing the browser cache.

Best Regards.

[Author]

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