HD having a different region is normal, ie my local news is ITV Central East but ITV doesn't broadcast that in HD so our regional ITV HD channel is ITV Central West so I wouldn't worry about the HD channel being wrong. I remember on Sky people was getting ITV Central West HD when they lived in the South west.
As for the SD channel, is the news shown actually Granada or Tyne Tees? the epg may say Granada when the actual program shown is Tyne Tees.
if you know anyone local to you on cable, check what ITV channel they get on their VM box, you will probably find its the same as yours. I