why have I received a conditional offer of I have already completed my a levels??

What are the conditions? One of the offers I received when I applied during my gap year was a conditional offer, but the condition was simply to provide copies of the certificates. If the conditions still relate to you achieving something you've already achieved, get in touch with your university so they can give you the correct offer.

Yes they want me to provide copies of my certificates. I don't understand why though and how other students don't need to do that.. maybe because it was almost two years ago?

Yes they want me to provide copies of my certificates. I don't understand why though and how other students don't need to do that.. maybe because it was almost two years ago?