The answer
Custom hook programs can require additional accounts or actions, potentially including transfers outside the token being sent. Support varies by mint and hook implementation.
What to do next
Read the transaction simulation and instructions in a wallet capable of displaying all required accounts and transfers.
Solscan — Solana explorer
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Ledger hardware wallet
A hardware signing device to compare for supported Solana assets; it does not fix Solana network, token or smart-contract faults.
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