dhcp leases and hotspot users

I have deleted all dhcp server leases as well as all hotspot users.

When they try to reconnect I’ve noted a strange thing : there are more hotspot user appeared with their own ip address than the active dhcp leases…

Each hotspot user shouldn’t get a dhcp lease before to become a part of hotspot system (so at least as many dhcp leases as hotspot users) ??

Or.. hotspot user has its own “dhcp method” or getting a lease some other way ??