John Bruce, Baron of Clackmannan - Incorrect Ancester

Starting a discussion at the profile is the first thing. It will remain even after resolved in case it was a case of mistaken identity, or something else, that is commonly made.

Another thing you can do (since discussions aren't necessarily active), is to post to a Geni Project where people are active in sorting through conflicts and duplicates in the European Medieval period.
https://www.geni.com/discussions/158450?msg=1586875

make sure to post a link to the profile (copy the page when on the main profile, and paste that web address into your posting.) A number of people active there have a lot of experience with older profiles and sources.

Thanks Dean