Blog home page has canonical link that is incorrect. Do not see where to change this

As part of our website we have a wordpress blog in a subdirectory. I scanned our main site for broken links. The scan included the wordpress blog in the subdirectory. Some “broken links” showed up that have never been present before. The problem is that the “otherblog” has nothing whatsoever to do with our website–it is a separate property. We don’t know how the value for the “otherblog” is getting in.