The answer
The transaction may have expired, failed or not been submitted successfully. Some wallets display submitted transactions before the chain confirms them.
What to do next
Check the transaction signature and the token account on a Solana explorer. If no confirmed signature exists, rebuild and send only after checking the prior attempt.
Solscan
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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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Frequently asked questions
Could a failed and retried Solana payment be duplicated?
It is possible to send a new separate payment after a completed one; verify chain status before retrying.