Wordpress is adding numbers to my URLS - is this a problem for SEO and is there an easy way to stop it?

my website keeps adding /image-gallery/733a02c8d6dc1d04948b0c2f542cbf62 at the end of URLs - is this bad for SEO and is there an easy fix?

If i implement this change, will it remove those numbers to already published urls / posts?

submitted by /u/Intelligent_Way9777
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