The handles of the vtkdistancewidget move when I move the camera

Hello, I found a weird behabiour when I move the camera when I am using the vtkdistancewidget or vtkanglewidget. When I move the camera the handles separate from the lines of the widget. Someone knows how to correct this behaviour? I would like the handle to be always joined with the line even when I move the camera. I show a picture with this issue. Is it a bug? Thank you