Mobile device support, issues with the forum’s functionality or display.

Good afternoon.
The user tried to change their nickname, but the nickname change form is displayed with diamonds and question marks.
Browser: Mozilla, version 81.0.1

I'm not sure if the screenshot shows the nickname change form because the address bar shows /login.php (which should be the login page), but the form is displayed correctly at https://forum.heroesworld.ru/change_name.php
Could it be that the user's authorization has expired, and they were redirected to the login page?



More details are needed; I haven't been able to reproduce the situation.