Object with origin set to geometry not at center when coordinates are set to 0,0,0 When importing glTF models from Sketchfab sometimes they are not at the center even after setting origin to geometry and setting coordinates to 0,0,0. Frame selected show only these parts, the ball is the whole model. No modifiers.
Blender 2.83.3
Model https://sketchfab.com/3d-models/sci-fi-drone-74a5a6bcc9cf4a9f877364ab700623ba
There's a thin line, it means that your object has a parent and that its location values will remain the ones before parenting wherever it is now in your scene, you need to:

Go in the Properties panel &gt; Object &gt; Relations &gt; Parent and remove the parent (yes, cruel).

Or AltP &gt; Clear Parent.

Or header menu &gt; Object &gt; Parent &gt; Clear Parent.