Solved! In case that comes up again. It’s not the plug in issue. Apparently on wordpress/woocommerce, if the Attribute slug is in Greek Language (Apparently for other other ones as well), breaks the permalinks, as soon as i changed the ONLY the slug in english, works like a charm. BTW great plug in, saved me a lot of pain. I am building a bookstore and searching only for the Author name with this plug in was great, having 40000 authors, filtering would never work. Thanks again.