All the listed factors could potentially make a source unreliable, but among them, the most significant is "There is an inaccurate fact on a page of an article."
Inaccurate information undermines the credibility of the source, as it indicates a lack of fact-checking or expertise. While typos and disagreement from non-experts can raise concerns about reliability, they do not have the same weight as the presence of outright inaccurate information.