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I see years old questions at the top of my feed which show as being modified recently but nothing within the actual post shows evidence of that.

For example this question: Arduino CNC - which vacuum pump?

Is this a bug or is the question actually being “modified” such that it seems like a “new” question and is being kept to the top of the feed?

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This is just the Community♦ user bumping questions with no accepted answer.

This is an automated means by which the site tries to call attention to questions which might need it. See the second link above for a description of the "rules of the game".

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