You'll be absolutely fine. There is nothing wrong with what they did. That is an old cabinet installation trick, to get pre-made units to fit, under certain circumstances.
There are many, many houses with built-in shelves and cabinetry just like that.
It's all set.
No worries.
There are many, many houses with built-in shelves and cabinetry just like that.
It's all set.
No worries.