Products leaving categories

详细信息

Hi, so we have a woo commerce store & have over 200 products in our store with individual categories for each set of products, what seems to be happening is we are putting the products into the right categories & then a few hours later we go back to that categories and they have gone missing out of the category they are spouse to be in which does not make any sense at all so need help to find out why they keep leaving the category they are meant to be in