Hello,

Usually our sale label show the percentage discount label with such kind of plugins and there is no fix for this
in this situation.

Please try and disable this option in our theme from Theme Settings >> Shop >> Product labels. And try using the woocommerce sale label.

Screenshot for Clarification: https://gyazo.com/a24d49219d322ef71f909deb350abe55

If the “Sale” doesn’t work then tell me then we will check the issue.

Best Regards