Why my Bitcoin Cash coins moved to another wallet if i did it on original Bitcoin on 12/12/2017? I have very old Bitcoin wallet from 2012 year. The last operation was 12/12/2017 - this was movement all sum to my another wallet.

I was very surprised today when i first time load this wallet into Bitcoin-ABC (bitcoin cash) and see this transaction inside it!!! I see exactly same transaction (moving same sum to same wallet alias on same date 12/12/2017) inside Bitcoin Cash blockchain.

Can you explain me how is it possible? As I understand Bitcoin Cash has separate blockchain from August 2017 so i should not see the last operation on December 2017.

I used this command to load my wallet into Bitcoin-ABC (bitcoin cash)
bitcoin-abc-0.16.1/bin/bitcoin-qt -wallet=my_bitcoin_wallet.dat -datadir=path_to_bitcoin_cash_blockchain
I see exactly same transaction (moving same sum to same wallet alias
  on same date 12/12/2017) inside Bitcoin Cash blockchain. Can you
  explain me how is it possible?


Bitcoin and BitcoinCash have the same history before August'17