When I hit reply on a new post, I often see a negative time for when I posted it, which steadily ticks down to zero, and then starts counting upwards normally. (See screenshot.) I've seen it as high as "-24 seconds ago".
- negative time is badly confusing, and should be displayed to the user. Perhaps "in the last few seconds", or "very recently", or "within the last minute".
- it might be good to also understand what is causing this issue in the first place