That's what you should get if you write something like dump @AoH; because @AoH "flattens" to a one-element list in the list context of the function call. (This was just a guess, but I'm sure in what I'll write below.)

This way, however, you can not easily access the contents of the deep datastructure, as you can't index the array in such a way that it flattens automatically, so you have to use a 0 as a first array index, just as CountZero said.

To change, either use a scalar variable, or (perhaps better) use an array variable, just assign it like @AoH= ({...}, {...}, ...);, not @AoH= [{...}, {...}, ...];.