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There is something strange with this answer and this question. Basically, I left a comment on my answer. Some time after, I deleted it to "rewrite" it and the system seems to see a "ghost" comment now:

enter image description here

But if you click, look, there is no 1 more comment:

enter image description here

I see that the label also says "add" but it's the first time I see "folded" comments with 2 comments. Looks strange to me.

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    You broke it! Prepare to be disciplined for that :P
    – balpha StaffMod
    Mar 27, 2010 at 9:38
  • @balpha Yeah, this made me hesitating a long time before to post it. Mar 27, 2010 at 9:57
  • I was surprised to learn that moderators or maybe even 10k's can see deleted comments as well. I took me some time to use the "edit" link when seeing a mistake within 5 minutes. For long I've just deleted and posted the corrected comment as well, not knowing I was messing up the system (or: messing up the view of those who get to see deleted things as well).
    – Arjan
    Mar 27, 2010 at 10:07
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    @Arjan: 10k users can't see deleted comments, and as far as I know, neither can moderators.
    – balpha StaffMod
    Mar 27, 2010 at 10:14
  • @Arjan Oh, I don't know if mods can see deleted comments (would makes sense) but 10k users can't, as shown on my screenshot :) Still, a delete/repost shouldn't mess the view. And something must have been changed between this morning and now (luckily I took a screenshot) because it seems fixed now. Mar 27, 2010 at 10:15
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    @Pascal: Yes, it's fixed now. You have me as a witness that you weren't dreaming :) Maybe it was some sort of caching issue (denormalized comment count on posts or something like that), although this is the first time I've seen this happen.
    – balpha StaffMod
    Mar 27, 2010 at 10:17
  • @balpha and Pascal: you're right, I was wrong as my memory failed me: Neither 10k+ users nor ♦ moderators can read deleted comments, so a deleted comment is as good as gone. The comments, do, however, still exist in the database and Jeff can see who deleted them should there be an issue. according to December's meta.stackexchange.com/questions/32651/… (and a fixed bug: meta.stackexchange.com/questions/36827/…)
    – Arjan
    Mar 27, 2010 at 11:02
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    This happened to me as well just yet. I knew there were comments because I deleted some of mine and flagged others as NLN. Now that a mod cleaned them up there is this ghost collapser that is left. First I blamed caching, but it even persists in a private browser window.
    – Luuklag
    Aug 26, 2020 at 12:23

1 Answer 1

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The counts are denormalized so they can be slightly out of sync. This is rare, though.

The daily process will sync any that it finds that aren't right; this one is already correct now. (This process excludes deleted posts, so you may see incorrect comment counts that persist permanently on them.)

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