Probably for a couple reasons:

First, HN prefers the source title unless that title is misleaing clickbait.

Second, the problem is not consistently off-by-one errors, as there is a manifestation shown in the bug of an off-by-much-less-than-one error. The problem looks like a "for some reason it seems to be roundtripping numbers in text through a numeric representation which has about [perhaps exactly] the same precisions issues as float64" issue.