Hello,
in one of my instances, the DHCP Server allocated an IP-Adress which is a static assigned IP-Adress in this VLAN:
As you can see on this picture, an other MAC is assigned static in the DHCP with this adress.
If you want to avoid that do not statically assign an IP from the dynamic ranges...
Cheers,
Franco
Did your range include the static IP?
The implementation is not ideal.
You might want to check this old thread (https://forum.opnsense.org/index.php?topic=25329.0).