Magento 2 – Duplicate products when exporting

We have the problem with a Magento 2.4.2 installation, that when exporting products approx. twice as many articles are exported as can actually be seen in the backend. If you sort the CSV by SKU you can see, that most article numbers appear twice in the list.

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SELECT COUNT(*), sku
FROM 'catalog_product_entity'
GROUP BY sku HAVING COUNT(*) > 1

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