G'day Fred,
Sometimes the quality of the sources may differ substantially with one source representing scholarly opinion, the other reflecting popular culture.
Or, surprisingly commonly, the other reflects not popular culture but the view of an idiot who should be locked up for his own protection.
See: Eurasian Land Bridge, Anti-metrication, Gatekeeper (politics), and, well, too many to mention, I guess. I think you could probably pick any POV, however, absurd, and find that there's a batshit conspiracy theorist who holds it. Further, that conspiracy theorist will either edit or inspire another loony to edit Wikipedia to push that POV sooner or later. We're too damn big.