Hello @unknownman888,
Thank you for contacting the support.
You must have enabled the breadcrumbs on your site that include the product categories and Google is finding the categories from the Breadcrumbs Schema and showing them in the SERPs.
If you are using the breadcrumbs of our plugin, you can remove the categories from the breadcrumbs by setting the Primary Taxonomy as None in WP Dashboard > Rank Math > Titles & Meta > Products.
Once done, check the product URL with the following tool and make sure that the categories are no longer included in the breadcrumbs Schema: https://search.google.com/test/rich-results
Let us know how that goes. Looking forward to helping you.