Configuration IPV6

Hi, I can reach my nextbox from my phone or any network except from my wifi…
When connected directly on my box it’s impossible to connect to the nextbox.

On the remote access, the IPV6 reachability goes wrong.
I managed the firewall on my box for ports 80 and 443…

The only point I see that can cause the bug is that on my Nextbox administration the IPV6 adress is not the same than the one detected by my box.

But I don’t know how I can change that so the adresses matches…