That's not normal, what kind of Freeview Box / TV do you have?
A re-scan may correct the issue, let us know how you get on.
I have got an aerial box ultra, t1050pvr, my Freeview.
have tried rescanning, saves channels back in same places.
have turned power in and off,etc.
Any other suggestions, I was able to move channels on another cheaper tv, but don't seem to be able to on this system,
It might be best to contact DISH TV who manufactures that box, you can read them via this website here: https://www.dishtv.co.nz/index.php?route=information/contact