I think the code in some sections of the forum is wonky, and has been ever since we switched over to vBulletin and set up all the Barrow-Downs style sheets. In days gone by I would have tracked the problems down and fixed them by now, but I don't have the time to isolate them, educate myself on the scripting language, and write and test fixes.
I don't think it's random. If you run into problems, note down the subforum you're in and post it here. That ought to help with step one anyway, isolating the problem.
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