Everyone's focus was on the UEFA and the CONMEBOL qualifiers, and hardly anyone took the CAF qualifiers seriously. But there are a few upsets happening over there. The match between Morocco and Guinea is scheduled for November, if I am not wrong. So the odds can change very quickly. If the gamblers feel that the odds offered by the sportsbooks doesn't conform with the current form of the two teams, then a lot of them will be making their bets for the under-rated team. The sportsbook will immediately adjust the odds, to take this into account.