Blender 2.91.0: How to re-align the local axis of an object that has 0 rotations to the global axis? An object that has 0 rotations displays the local axis that's not aligned to the global axis.
Please see the following picture.

All parent objects have 0 rotations.
How can I re-align the local axis to the global axis?
The object itself has a few child objects, and that child objects' local axis and rotations must not be changed.
Blender version is 2.19.0.
UPDATE 1:
The object and it's parents' delta transform rotations are all 0 too.

UPDATE 2:
I've included the blender file that has the problem - using Blend-Exchange (Please see 'Front Arm' object):
Besides primary transformations blender has Delta Transform which useful in some cases.
It's located in Properties &gt; Object &gt; Transform &gt; Delta Transform:

You can transfer primary transformations to deltas by applying them:

Blender hasn't Apply Delta Transform operator. You can only copy Delta transform to primary manually, reset deltas to default then Apply main transform to data.