If it works correctly then they’ll make their way back to the senders wallet eventually when the HTLC finally times out, but that time will differ based on where in the network it got stuck and the channel settings those partners have.
Discussion
I hope so. It’s weird though, I’ve seen that plenty of times but in every case I’ve seen it the sending wallet never said the payment had sent successfully. It always said the payment was in transit, or pending, or some other error. In all of these cases from this morning, multiple different sending wallets show the payments as successfully sent.