Plugin corrupted post_meta table

I enabled Post Meta Data Manager, then went to edit some woocommerce Coupon item. Before the coupon edit page completely loaded I quickly edited coupon title and clicked PUBLISH. In this case in post_meta it saved some 50 new meta records with the same post_id but with unrelated post fields (like taxes field that does not exist for coupon post type).

When I disabled PMDM no problem any more. Or when I waited on coupon edit page to completely load, then after publishing the post there were no new additional meta_post records saved. Not sure why the issue appeared when saving before page fully loaded, but I noticed that PMDM plugin takes a few seconds to load on post edit page, so maybe we need to wait before it’s fully loaded before publish the changes.