Agreed, thats what i thought when i first noticed it. That it was a bit weird and payed it no more attention, but one mission drew my attention back to it when almost all of the top quarter of the map was grey and i thought no that dont look right!
There was a door in the middle of one of these room that had the "normal" texture but was surrounded walls and a floor that was just one colour grey. :hmmm:
It seem a bit strange that they would texture the ship to have a certain look/feel and then do a random amount of rooms just blank. ???
maybe im just being picky