Cannot rotate object - Blend File included

Blender 2.93.6
For some reason I suddenly cannot rotate an object from any point of view in “Object Mode”. It seems to rotate only on some invisible axis.
Attached is Blend file of an eyeball, already mapped and ready to rotate.

Any help is appreciated.
Eyeball001.blend (3.9 MB)

You changed Delta Transform somehow (accidently applied to deltas?). Set rotation to 0 and scale to 1, and use Transforms instead.


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I think something may have happened when I was “mirroring” with the Mirror Modifier and then duplicated the eyeball. Then Appended it to e new project.