SSH into the ignitenet that has a duplicate mac address and change the mac to a unique address in the 3 commands below,
I did test it with the same mac for all three and it does work even though they should all be different.

uci set network.wan.macaddr="28:76:10:1E:96:41"
uci set network.mgmt.macaddr="28:76:10:1E:96:41"
uci set network.wan.clientid="28:76:10:1E:96:41"
uci commit
reboot


Below is only needed if you want to ssh back in to the new ip and check that all the changes were applied.
ifconfig


--Mimbach 2021-08-15