I am finally getting round to claiming my BCH from the fork in 2017 but am having a problem if anyone can help.

At the time of the fork I had X amount of BTC and was using Bitcoin Core wallet software. A few months after the fork I transferred my BTC to a new wallet.

Today, to claim the coins I installed the BitcoinABC wallet, downloaded all the blocks and then copied my old Bitcoin Core wallet.dat file to the BitcoinABC wallet directory.

When I restarted BitcoinABC wallet I can see a BCH balance but also all the transactions that occurred after the fork, BitcoinABC shows my balance close to 0 and not what I had at the time of the fork. The transactions after the fork are all showing as unconfirmed.

Do I need to do anything to get the balance to adjust, do I need to wait for the unconfirmed transactions to be rejected or do I need to issue some commands to get them rejected?

Any help much appreciated.