Reposition BVH animation

Questions
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1

SRS%CR4MGBQMCZ58Z8}%Y

When I use SkeletonUtils.retargetClip to redirect the BVH animation, the bones of gltf are reduced, so the skins are squeezed together. What causes this?

 const loader = new BVHLoader();
  loader.load("01_04.bvh", function (bvhResult) {
    const bvhSkeletonHelper = new THREE.SkeletonHelper(
      bvhResult.skeleton.bones[0]
    );

    bvhSkeletonHelper.skeleton = bvhResult.skeleton;
    scene.add(bvhResult.skeleton.bones[0]);
    scene.add(bvhSkeletonHelper);
    // play animation
    bvhMixer = new THREE.AnimationMixer(bvhSkeletonHelper);
    bvhMixer.clipAction(bvhResult.clip).play();
    gltfLoader.load("Ybot BvhName.glb", function (gltf) {
      const model = gltf.scene;
      scene.add(model);
      const skeletons = model.children[0];
      // 获取模型的骨骼
      var gltfSkeletonHelper = new THREE.SkeletonHelper(skeletons.children[0]);
      let gltfSkeleton = new THREE.Skeleton(gltfSkeletonHelper.bones);
      gltfSkeletonHelper.skeleton = gltfSkeleton;
      scene.add(gltfSkeletonHelper);


      let retargetedClip = SkeletonUtils.retargetClip(
        gltfSkeletonHelper,
        bvhSkeletonHelper,
        bvhResult.clip,
        {
          preserveMatrix: false,
          preservePosition: false,
          useFirstFramePosition: true,
          preserveHipPosition: false,
          useTargetMatrix: true,
        }
      );
      mixer = new THREE.AnimationMixer(gltfSkeletonHelper);
      mixer.clipAction(retargetedClip).play();
    });
  });