One reason for an incomplete luminaire parts list in the room summary could be recessed luminaires. If the insertion point is inside a wall, the luminaire will not be assigned to this room. The luminaire should then be moved into the room. The rest of the housing can still be inside the wall.
Another reason might be that luminaires have been inserted into the project in the wrong view. Indoor luminaires must always be inserted in the storey view or room view, so that they will be assigned to the room.