It could be a netsplit. Have you stayed on the channel for a considerable length of time (a few hours) without them 'returning'? Have you tried different servers on that network?
If the network this is happening on is DALnet and the channel is for filesharing there's a good chance the channel has moved to a new network because of the new rules. Does the channel topic mention a new server? Have you been on the same channel on other networks to see if the same people are there?
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