Mmm wouldnt that be because of Week 23/ 2007's expense? Income Tax. It shows as "profit" but really, you had to pay income tax, so that reflects in the pre-tax amount.
I guess when you think about it, its kinda backwards. The pre-tax amount shown to everyone is what you truly made.
Wheres the numbers shown in the office page show what you made on "paper".
Least, thats the only conclusion I can think of.