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How come the same article has been posted four times in the past 18 days? https://news.ycombinator.com/from?site=runjs.app

Doesn't HN have a temporal deduplication system?

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When I tried to post a duplicated link HN will just redirect me to the existing one, but somehow everyone else seems to be able to post the same link multiple times.

Same. (but of course, you don't see the duplicates when they do accept your post)

You can also see duplicates e.g. here: https://news.ycombinator.com/from?site=semianalysis.com

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