Why can't anda go into the imperial gaurd places even though anda are know as the Champion and still can't be in guard bartracks and stuff like that?

do anda mean champion of the arena?

Because thats how it is no matter what anda do they wont allow it but on some occasions the guards don't ask me to leave at all!!!

If anda mean the Imperial Palace and the other areas like Ocato's room anda have to do the Theives Guild quest but if anda mean the reagular Barracks then idk but anda can illigaly ^_^

I think because the politics of the monarchy,the kings atau Septims are at the puncak, atas so they have the
ability to use the whole tower floor 1-5,Ocato 1-3,you 1-2.

because anda are just a fighter not a guard

I dont know probably its A glitch atau something xD