Fresh installation looks weird and unable to register

[astro]

Hello guys,

Just installed Nodebb to Ubuntu server with Nginx reverse proxy according to the guide (https://docs.nodebb.org/installing/os/ubuntu/).

But on the homepage, I see only three words: "Categories", "Register", "Login". The problem is that I need to create the admin user but registration is impossible due to username validation error. Under username field I can see:

A unique username between and characters. Others can mention you with @username.

And whatever I type, I get:

Username too long

I've tried upgrading and rebuilding assets, nothing seems to help.

No errors seen both in the browser console and in the output of ./nodebb dev

Thank you in advance for your help!