How has one of my comments disappeared?

I posted a comment on somebody's question a few days ago, and that comment has disappeared, as did his reply. It was there for some time. The reply has also disappeared from the discussion tab on my personal "you' pages. The question has about 10 comments on it and hasn't been "best answered' yet.
How does this happen?

sort by: active | newest | oldest
Re-design7 years ago
Sometimes the software is buggy and deletes stuff.

The admin. has the power to delete comments and replies the don't like or are objectionable without leaving any trace of it being ever there.
caarntedd (author)  Re-design7 years ago
Could the author have it removed? I don't believe it was objectionable. This happened to me once before, and when I asked what happened I was basically told I was stupid.
It's one of those charming little mystery features that give the site character. It's possible that it might come back, though. Just a couple of days ago, one of lemonie's comments disappeared after I replied to it. My reply and all the rest of the thread were still there, but lemonie's post was just gone. Several hours later, lemonie's post magickally reappeared as if it has been there all along.
I like to think of the boards on this site as being kind of like the staircases at Hogwarts....
caarntedd (author)  RavingMadStudios7 years ago
Sounds reasonable.
If it was flagged, or if the author removed it, it would say so.  Occasionaly you'll see the default phrase around the site where such things have happened.
it is some kind of bug I know personally it is annoying beacause it has happened to me.Why?