Wordpress plugin changes URL of @username on Wordpress side

The Discourse plugin integrated into Wordpress works fine, however I just noticed from a broken link checker that with a Discourse comment that references an @ username , the @ username URL morphs from forum.domain.com/user/username on the Discourse side to domain.com/user/username on the Wordpress side, and now shows as a busted link on my Wordpress install

Any suggestions on what box in the dashboard needs ticking or resetting?

Previously reported here:

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