When a commit URL could mean several different commits, Phabricator shows all the commits that fit the ambiguous identifier.
There are two commits this matches, rPbd3c2355e8 and rPbd3c239d5a.
Mostly fixed in T13001. Ambiguous commit URLs now show this:
TODO: The repository in the crumb is currently not a link, but should link to the repository that the commit belongs to. This likely involves adding another mode to the buildCrumbList method in DiffusionController.