It’s not the acquisition normalization, it’s the behavior of the Slice view for this data that is wrong.
The transform is basically identity (no visible difference if you remove it), so at most it’s being overcautious.
>>> arrayFromGridTransform(getNode("U*m")).max()
0.043207675834310066
You can remove the nonlinear transform and volume render and the skull is not distrorted, but the slice view still is.
The direction matrix is definitely sheared, and that seems not to be taken into account by the current slice view code.
@lassoan as I described above this shearing is only in the reformat view, not in sagittal, so the problem is with the initial Reformat display.