I also have a device in the dhcp lease list but cant find it physically . So is the device named - just a non existent virtual device entry in openwrt or something else ? Please tell me more as I fear about the security and privacy of my network router .
It is highly likely that MAC address randomizatoin is responsible for the unknown device(s) in your DHCP lease table.
If you have Android or Apple devices, they may have this feature enabled as a privacy measure.
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You are good. You already derived this. Yes i have mac randomization on some devices by default.
I think this was the issue with high probability but no way to be final sure.
Thank you. Learnt a new thing just at starting to use openwrt. I like it.
great!
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Thanks! 
Offcourse. Done
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