Uni of Exeter offer reduced? Watch
If the answer is no to all of those then you or your referee have obviously said something that makes the university want you! Check the offer carefully though as there may be a catch that means you have to firm the place to keep the reduced offer, and/or you have to accept the place by a certain time to keep the offer.
Well done of your offer!
Perhaps just email them and have a run through the terms of your offer.