It's easy if you can use cli_wallet, but anyway, in the past, you've somehow executed this transaction:
set_withdraw_vesting_route where you've set your preferences for power down, that is, to always power down to yourself, but to automatically power up whatever is powered down.

https://explore.openhive.network/transaction/bd071a87930e1459c1594ec95447b4b2f9cd5218
To revert that you should execute it once again, but this time telling that you don't want to "auto_vest".

You can go to ecency and to that:

@purepinay/wallet

Look at "HIVE POWER" section, click at your HP amount; you should see three options, click the third one "Withdraw routes", there, account should be obviously yours, percent 100, and Automatically power up obviously No. Once you have that set, cancel your current power down (as old rules applies to it) and start it again.