Switch XMG-108 and XMG-108HP

server3

Hello,

I have 4 of these switches connected in series. The LEDs indicate LOOP between them. The network works. I tried connecting the switch to the switch with a cat7 cable and a 10gbe optical cable and it still indicates a loop (the green LED blinks slowly)

even if I connect two switches to each other and nothing else is connected, it automatically indicates a loop.

Is this normal?
I haven't found anything about it anywhere.

Thanks, who knows what it is.