Allow MAC address doesn't work good

Hi everybody,
I have this application: “C:\Program Files (x86)\FileZilla Server\FileZilla server.exe”
And I make this rule:
Source Address → MAC Address → I write something random 33-33-33-33 (etc.)

It make everything ENTER from the LAN into that application, if I told to COMODO to make enter only the MAC above.
Instead, If I chooce IP Address and It works.
Please help.
I also made the converse try:
Exclude Source Address → MAC Address → MAC of one device in my LAN
It doesn’t works.
It’s like COMODO doesn’t SEE any MAC address but only IPs.
I don’t think this beaviour is normal.
I want to make rules based on MAC address of my LAN devices.