Altough it might look weird on the first glance that´s how Airbus designed the nose section and forward doors, probably becuase of the way the fuselage is designed. Even on the A330/A340 the same design can be found. It might be a little over exaggerated the way ini modeled the forward door but that is quite close to the real thing. It depends a lot on perspective, it is more visible when looking from the top rather than from below.