Looked at your posts and have this to comment.
The insulation in the attic appears to be cellulose and equivalent to an R-factor of 15.65 for the apparent 5" installed.
If that is a poured foundation, they must have used form liners to simulate brick.
Looks like construction joints and mortar spalling.
Anti-tip devices should be installed as recommended by the Manufacturer.
Sloppy work and unacceptable performance standard expected of a new Home.
Check the riser height, should not deviate more than 3/8".
The under stair construction appears to show that the stringer cut out is way over the recommended practice. A minimum of 3 1/2" of the stringer should be left after the cut out is made. Three stringers should be installed in this stairway.
It is conceivable that the concrete floor was poured after the stairs were built and that would explain why they appear to be sunk in the floor and the bottom riser looks buried. And yes, no P. T. observed.
Rust stains, evident from either steel frame around glass blocks from water intrusions. Appears that rust stains are also coming down from the box header.