JohnP in Flarum it's sometimes a bit confusing because the first post is treated differently.
The number shown on the Flarum discussion list is the number of replies, which is the number of comment minus 1 for the first post.
Things start to get complicated with custom post types, because custom post types aren't comments, and as such aren't counted. The Wordpress extension is the only extension in the Flarum ecosystem right now that uses a custom post type as the first post of a discussion, and this leads to various issues, most of which have been patched in previous updates. But maybe there's still something wrong with Flarum trying to subtract one from the number of comments that doesn't include the first post.
Can you clarify how many replies you actually see in the discussion, without counting the Wordpress summary? Are there 2 or 3 user comments in reality?
JohnP It also doesn't list the user or time of the first reply under the discussion on the forum index page, it only displays them from the second reply
If you mean the author/date of the Wordpress summary post (first "post" in the Flarum discussion) isn't shown in the discussion list, there's actually a setting for that https://kilowhat.net/flarum/extensions/wordpress#set-the-summary-post-as-the-last-post-of-new-discussions If you meant something different, can you clarify? It would be odd if the first user comment was causing an issue.