My instance doesn't receive comment replies and DM

Hi, I just installed Friendica but I have some issues.
My instance does not receive comment replies and DM.

View from my own instance:

View from my other account on venera.social instance (cat avatar) :

As you can see, from my other account on venera.social I replied to my account on my own instance, but my instance did not receive them.
It's the same with private messages, venera.social instance gets them but if I reply from there my own instance will not get the replies.

BTW, I installed Friendica through Docker by following the official instructions.
I have a reverse proxy in front of it, which is Caddy web server.

Thank you