Whilst I have been "fiddling", I haven't done anything to the styling used.Shock, horror! What's happened to the Forum (its appearing as a list type thing on my phone) & why can't I change it back? (to responsive style).
Am I right in thinking that you use Opera Mini browser, littleme? If so, it will be due to the way that it works, I'm afraid (it doesn't show you websites directly; it compresses them via Opera's servers to try and speed your viewing up, but it can mess things up along the way).
Unless, of course, you used a non-standard style, in which case I did delete some old, redundant ones. Try clicking here to choose a new one: http://www.staffordforum.com/xf/index.php?misc/style
Hopefully your problem will just be temporary, until Opera's parser catches up. Otherwise, the upgrade in a few days should help.