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I encountered this this strange bug with the activity timestamp recently, it isn’t the first time I have seen it. Luckily, it seems to have little or no effect on functionality (other then being confusing). It usually goes away if I reload the page.

Just tried to replicate it a few times but haven’t been able to. Any consistent conditions that produce it?

Not that I have found, I just seems to happen randomly.

happens to me a lot, i get a similar notification in text messages, too. not sure what it means

It can be a slightly out local clock (pc), with the resulting time difference to server (after zone factored) causing small negative results. Could be eliminated with an abs() on the result.