The wide posts have happened before ... and if memory serves it happens when a poster composes in another place and pastes into the regular AWAD reply box ... or something like that.
I can't read the wide posts very well as I get dizzy(ier) with all that swooshing back and forth.
And I hate to miss the fun.
Sometimes it goes back to normal width on second page or the poster corrects it and all posts follow suit. There's another one - suit!
(whirling off to another thread)