Why will a comment disappear?

th3_jungle_inv3ntor again.  Why will a comment disappear from the comments on my instructables?  I was meaning to reply to the comment, but when I went to reply to it, it wasn't there.  Thanks for answering all my questions.  :)

caitlinsdad4 years ago
The person who posted the comment has the option of deleting it. Maybe that person did not want it to remain in the conversation or their question was answered. Or it is the random comment disappearing bug which comes and goes when they do something to the system.
Thanks for the answer!
Oh, and comments flagged or spammy will be removed by staff. You will see topics bumped up with no recent comments added to it.