Steel stringer staircase | Construction error? Your assessment

Hello dear forum members,

we are currently building in a new development area in northern Germany.
We have a question for your collective knowledge regarding our steel stringer staircase:
We commissioned an "established" company to build a steel stringer staircase, quarter-turn. The step height is about 19.3 cm and the depth of the steps is 25 cm.
This would mean that with 15 steps you would get from the ground floor to the upper floor.
Now the company has installed the staircase.
Disaster: The last step on the upper floor ends at the finished floor height and is only 15 cm wide. This is probably due to the width of the steps in the quarter turn.

We did not expect this at all, meaning our already installed staircase lighting (electrics) of course does not fit and we also do not like the idea of ending up on a half step on the upper floor.

The company could not provide us with a construction drawing in advance, "too much to do." We probably should have already gotten suspicious and stopped the whole thing?

Can you give a brief assessment of the staircase? Do we have to accept it as it is or should we stand up for ourselves?
We are really "stunned" in a negative sense...

Thank you very much for your opinions and best regards
Tita

Hm, you can't see anything there. Maybe add 1 or 2 more photos ... overall view and view from the upper floor. Where and how are the steps supposed to be placed?

Yes, it is not entirely clear what this is about. Is it about the top step simply being shorter than the others? That would then be nothing unusual. The background is that when taking measurements, something often turns out differently than in the planning, and you don’t start recalculating the slope ratio. Often, the top step is therefore already shorter according to the plan. Why is this now a disaster?

We also have a narrow step on the upper floor. It's completely fine, even if it might have been possible to perfect it. It works well and doesn't really stand out.

Is the exit level meant that finishes flush with the top of the floor?

The landing of a staircase is not the same width as the steps. In my old carpentry textbook, the landing is half as wide as a normal step. If the height aligns exactly with the later floor covering, it is well done.

Best regards
Gabriele