Hello, Elle!
I think the best thing you can do to help the builders is to stay out of their way!
The numbers are out of sequence on the "latest" post.
When another post arrives and the "latest" post becomes the "second latest" post, the numbers are corrected.
I have checked several threads and it is only happening on the PCT.
I can not understand it, too, Elle.
I can't see it just being a Scottish problem, surely?
The numbers don't bother me, but the post apparently being displayed on the main page, but not being there when the thread is opened, does bother me.
I have done everything I could think of, to possibly help, including logging out, clearing history and cookies etc, switching off my router for ten minutes etc, and sent a wee prayer up to St Jude, the patron saint of lost causes....to no avail!