Actual topic looks like this:
That’s two posts (i.e., one reply), plus pinned/unpinned, although it says “3 replies” in here too so that’s sort of consistent. There’s no flagged/deleted/other funny business involved.
Also, the pager thingy says “4/4” so that’s a third take on the number of things on this topic… That goes with the “4” on top of my avatar in the summary section under the first post, maybe?
The first post has been edited - is the version counted as another reply, perhaps?