https://news.ycombinator.com/newsguidelines.html
(I'm assuming, of course, that it wasn't the article title that got subsequently changed. If that was the case, ignore the above.)
Not the first time I've seen you say this. Would it be worthwhile to fetch articles when they're submitted, if only for your own sanity?
On the other hand, titles changing on the fly isn't that big a headache as far as sanity-affecting headaches go. NYT does it all the time, or used to. The main thing I don't like to do is scold someone for breaking the title guideline and then finding out later that it was the site, not the submitter, that changed it.