Hello, The difference in the stair reinforcement quantity is due to the stair reinforcement drawings. Drawings of straight-armed ladders are made automatically in the program. The stairs in your project are spiral staircases. When you take the drawing of the stairs on the 1st floor, the reinforcements of the stairs with the DD section are drawn differently than the other stairs, which makes the reinforcement quantity different. The ladder can be created as in the example. You can also make the necessary arrangements for the staircase drawings by using the 2D drawing tools. Good work