I've never come across something so confusing, really guys!

I tried several times to play around this--At 1st it seemed that Cb was going to be the key, but it failed the tests somehow..
E/Fb seemed to work, it passed other tests..
But then guess what,
A/ Bbb surprised me

it sounded like the key.
I know many might disagree, so I compiled this as proof:
Key of
A/ BbbMEb/Ab-Bb-Db-Eb-Gb [Ebm11]
Ebb/ Gb-Bbb-Db-Fb or Ebb/Bbb-Db-Fb-Gb [EbbM9 / DM9]
Db/ Fb-Gb-Ab-Cb or Db/Gb-Ab-Cb-Fb or Db/ Ab-Cb-Db-Fb-Gb [Dbm11] {this is a 3}
resolves to..a 6-2-5-1
[6] Gb/Fb-Gb-(Ab)-Bbb-Db
[2] Cb/Eb-Gb-Bbb
[5] Fb/Ebb-Gb-Bbb-Cb
[1] Bbb/Cb-Db-Fb-Bbb
Now I'm really confused..
Fenix, it would help if you gave your voicings, it doesn't take much time.