Very strange.

I have 4 wallets in Armory.

I made backup for each, by exporting keys list, as in previous post.

For these 4 wallets, I have 9 pairs of Address strings + Private key plain base58

On https://www.bitaddress.org , when I enter the private keys and ask Details, 2 of the 9 give me the correct addresses.

What is this problem ?

I really need the private key of my previous post wallet to produce the correct address, because I can't access the new Bitcoin Cash BCH, as the private key generates an other empty address instead of the good one...