Differences in building permits in the construction file

Hello everyone and good evening,
I am new here and come right away with a tricky problem.
I own two condominiums in a residential building with 11 apartments.
There is an official certificate of completion and 11 land registers.
All 11 apartments were built simultaneously in 1996-1997 under the same builder in an old existing building from 1930 or so.
The problem: there is only one building permit for 6 apartments.
The other 5 apartments, although built at the same time, are listed as existing apartments in the development plans.
However, these 5 existing apartments lack the entire approval process as precisely outlined for apartments 1-6 over multiple pages.
Noticeable is the numbering here:
Apartments 1-6 are approved and those numbered 7-11 are the existing apartments, which 1. of course were not previously already existing, and even if they were, they should have been approved at some point, e.g. 2 years earlier.
Before I possibly wake sleeping dogs at the building authority, I ask you what might have happened here?
Further back in the building file, the square meters are again listed and stamped with [„Anhang an die Bauakte“], but in my eyes, this cannot be complete this way.
As an example: my apartment is upstairs and there are no indications regarding the staircase, which I actually know differently, such as the width of the steps etc.
Then a structural analysis is missing; don’t apartments that have been subsequently built upstairs need a structural analysis, e.g.?
Or is that sometimes simply not done? In any case, the building file lacks indications that these apartments are upstairs.
In the certificate of completion, this is clearly described, but I do not know if that is sufficient to prove it was also approved according to building regulations? Because when apartments are subsequently built in existing buildings, it is not automatically the case that they are checked for building law before the review of the certificate of completion.
Could someone maybe break this down for me? Whether this is normal? Whether, for example, I need to do something to improve the building file? If you have any questions, please feel free to ask, maybe I forgot something important.

Simply don’t think about it anymore or even ask. Otherwise, there can be real problems.

Stay completely still. Can really cause stress

Hi guys, yes, that's what I thought. The question is, can you still explain to me how this could have happened? Because it is the case that in the approval process for apartments 1-6, these apartments 7-11 were also included, namely in the overall drawing. That means the building authority knew/knows about the other apartments. Also, during the course of this process, the entire living area appears in several contexts. Shouldn't the building authority have asked about that? For example: if someone applies for approval for their basement or attic conversion, doesn't the building authority then check whether the rest of the house has been approved? Or is only what has been applied for always approved and the rest ignored? Another completely different question: In the building plan for the approval process apartments 1-6, 2 patio doors are already shown. Does that automatically mean they are approved?