Thanks for the zap, and good question. I checked why, and my earlier steps were missing one detail. If you restored through File > Import Wallet > Mnemonic Words and pressed "Discover Wallet", Sparrow scans the seed for history. In its WalletDiscoveryService (ElectrumServer.java), if any Whirlpool account on that seed has ever had a transaction, it adds all of them back: Premix, Postmix and Bad Bank. Since your seed was used with Whirlpool before, they'll come back on every machine that way. To get a wallet with only the main account: 1. File > New Wallet, give it a name. 2. Keep Single Signature / Native Segwit, then for the keystore pick the Software Wallet option with Mnemonic Words (BIP39). 3. Pick your word count, enter the seed (and passphrase if you have one), click Import Keystore, then Apply. That path just imports the keystore and doesn't run the account discovery, so no Whirlpool tabs. Your coins and history in the main account load the same.

GitHub

sparrow/src/main/java/com/sparrowwallet/sparrow/net/ElectrumServer.java at master · sparrowwallet/sparrow

Desktop Bitcoin Wallet focused on security and privacy. Free and open source. - sparrowwallet/sparrow