I had random issues with LACP teaming for a bit. Oddly as soon as I started a tcpdump the interface would go up and down with me stopping and starting it. I ultimately abandoned teaming/bonding because the performance gain was nill.
PS when I say interface goes up and down I mean it started/stopped responding to pings.
Even when it gets to the webui the config on the backend would be the same I suspect. I just know that LACP can be a pain for very little to no gain in a home NAS Setting. My issue may have been my Zyxel switch too, which wouldn’t surprise me to much. If you really want to have that dual nic setup I would prob stay away from LACP and just use balance-rr or balance-xor. Note that those modes are not switch dependent.
I know that I’m making an assumption that you’re trying to use LACP, but that seems to be what most folks run straight for.