categories are cloned when importing goods

There was a problem that manifests itself repeatedly. The theme is installed, after a while, when the products are updated from the csv file, the categories begin to be cloned by standard import. Each product creates a new category and places itself there. We tried to disable all plugins – the situation has not changed. Woocomerce latest version like wordpress. It is noteworthy that the download file was tried to be used on another site and a similar error does not appear on another topic, everything is correct.
https://www.iterna.ua

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Hello,

Could you please check how it works with the default wordpress theme just to check whether the issue is with our theme or not.

Because the Products Import/Export is woocommerce functionality and our theme doesn’t influence.

Best Regards

[Author]

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