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I really don’t see how WP External Links would cause this.
The issue seems to be with some <small> element that gets it’s opening tag escaped but not the closing tag (see screenshot https://prnt.sc/Z5hYeva3FX9Z ).
WP External Links doesn’t even do anything to plain anchor links like href=”#” like this broken link. If you check the source you will see it’s missing the data-wpel-link that should be added to affected links.