Problem with main categorry

Hello,

I have a problem with the categories.

If I choose several categories for my product, the one I choose in main categories is not actually the main category in woocommerce.

So the url of the product is not that of my main category and the related products are not those of the main category.

If I put only one category, it works correctly. The url and related products are the right ones.

Would you have an idea of the problem?