My first message here

Hopefully someone can help me !
I have a CS918ii, and in normal operations (other than testing) it is connected with an ethernet cable and Wifi is turned off.
In the menu I see that my MAC address changes every time I reboot it:



Somewhere else in the menu there is a "Wifi MAC Address", which seem not to change, but I am not interested about it since I am connected with a cable.
So my questions are:
- Do I look at the correct place ? It is the first time I see a MAC address changing by itself ! Anyway this really has the format of a MAC address...
- Why does it change ? How to make it NOT change ?
- Are there interests in having a changing MAC ? I have my own network so I don't believe I am MAC-filtered anywhere.
My goal was to configure a DHCP static lease.
Thanks in advance for any help
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