Why I get same result by using Object3D.getWorldPosition in some model,but another not?

Questions
1

I tried to use Object3D.getWorldPosition() and create info label.when I traverse model group and get position,positions have no deffirences.but when i use another model,positions are different.I do not know what’s wrong?
there are my code:

loader.load('xxx.gltf',(model)=>{
 model.scene.traverse(function (obj3d: typeof Object3D) {
    if (obj3d.type === "Mesh") {
      const pos = new THREE.Vector3();
      const position: IMeshPosition = obj3d.getWorldPosition(pos); //获取obj世界坐标
      console.log("object3d", obj3d, position);
    }
})
2

I’m afraid the issue is not yet clear. Do you mind explaining in more detail?

3

My pleasure to receive your reply,
Of course, the original model type is RVT, and we converted it to GLTF.
However, when I use the gltfLoader.load function to load the GLTF model and traverse the model group to get the mesh world position, I only get the same position in different meshes.
I compared this model to another model downloaded from the internet, and the meshes in the other model have different world positions. I am very confused about this.