A bunch of old posts from 2018 are getting "necro-edited" and floating to the top of the index

Is anyone else seeing this? Some kind of bug happening?

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yes me too, looks like some users edited their last post (so it got pushed to the top not sure if they did that on purpose), here’s 2 examples

and I just checked some of the profiles they haven’t been active for years (so I doubt it’s done manually.. maybe a bug or some automation from the forum?)