unknown and known devices connected to wifi just after having changed the password - Time Warner Internet

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This question is about "unknown and known devices connected to wifi just after having changed the password", with Time Warner Cable internet and apps. The client list in the wifi router (ubee) lists unknown devices in the client list connected via wifi. So I changed the password and changed it in only one of my machines. After this the client list still shows unknown & known devices with the known devices not yet knowing the new password. I rebooted the router. Of course I hit refresh multiple times. No change. How can this be?

unknown and known devices connected to wifi just after having changed the password?
 
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