Ethnicity question

[HarrysMum]

My Ancestry DNA came back and the new update has only very slightly changed it, but I still have a question.

I have East England, Essex 46%.
Scotland and Ireland 44%
Germany 6%
Norway 3%
Baltic 1%

I’m fine with all of those except the England one.

One great grandfather was from an Essex family.
One great grandmother from Germany to way back.
One great grandmother from Ireland
One great grandfather from Ireland
One great grandmother from Cornwall
All the others are Australian back at least a couple of generations, although my paternal grandmother’s family is mostly all Scottish Highlands.

My question is why East England only the English percentage? What happened to Cornwall?