If you receive an Invalid Signature error try re-importing your account using the latest recovery phrase or private key.
Some wallets like Exodus rekey imported Hedera accounts, changing the 24-word recovery phrase to a 12-word recovery phrase as well as changing the private key. If you have ever imported a Hedera account into Exodus, your private key for this account is updated on the Hedera network but will not be updated inside HashPack until you re-import the account with the latest credentials.
Rekeying your account using HashPack will also require you to re-import your account on any other devices this account was previously imported with using the old phrase/private key.