I am having exactly the same issue again! How weird. Did not touch the settings. I simply changed my timezone (but not the time) on my computer sometime yesterday, possibly while browsing FT.
It is 22:34 UTC.
My computer is set to London time, and shows correctly as 22:34 (GMT).
My Flyertalk timezone is set to Brussels (CET, UTC+1), where it is currently 23:34.
I would expect current posts to show as 23:34 like my FT time zone, but they show as 00:34!