It means the router isn't considering the packets coming from rogue network agents, if you know how deauth attacks work the rogue agent sends a packet to the router spoofing the mac address and pretending to be the device it wants to disconnect from the network so the target starts a new handshake and then have the handshake captured to serve as material to weaken the encryption.

I don't know how the router is being able to distinguish which one is the real one, but it's really powerful it does.