Category pages dont work | WordPress.org

Hello,

the category pages on our wordpress site dont work.

If i open a subcategory, it just shows me the main-category.

For example on https://inziders.de/beitrag/category/marketer/gerd-breil/

The main-category is Online Marketer.
The Link redirects to the subcategory Gerd Breil.

The URL is still correct after opening but the page i see is the main category.

How can i fix this?

best regards,
Marco

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