Box widget for Point Volume Interpolator makes no sense

The Point Volume Interpolator filter allows you to select the volume in which you want to interpolate values. However, the 3D widget showing the box does not correspond with the volume actually interpolated. To replicate, do the following:

1. Load this file: points.vtk. Apply.
2. Add the Point Volume Interpolator. Note that the 3D widget doesn't seem right.
3. Apply. Note that the volume interpolated is not the same as the 3D widget.