fuel network Verification failed due DHCP Server

Hi Friends

I used mitaka-9.0.

I find network verification failed at FUEL Web GUI.

Verification failed.

Node controller (c6:2c) discovered DHCP server via ens32 with following parameters: IP: 192.168.0.123, MAC: 00:50:56:aa:a7:b6. This server will conflict with the installation.
Node computing (43:5c) discovered DHCP server via ens32 with following parameters: IP: 192.168.0.123, MAC: 00:50:56:aa:a7:b6. This server will conflict with the installation.

The 192.168.0.123 is my master node (fuel web UI address and PXE dhcp server.)
Why to do display this erro log?
Thanks everybody.