Why, when I log in to Telegram via telethon using a proxy, does my IP get scorched?

Question

Python

I use the telethon library to interact with the Telegram API.
For authorization, I use the code from the documentation , but when Telegram itself reports a new authorization, it gives out not a proxy IP, but mine:



My code:

from telethon import TelegramClient
import socks

phone = '+7..........'
api_id = 1234567
api_hash = 'abcdefd'
session = phone

client = TelegramClient(session, api_id, api_hash, proxy=(
    socks.SOCKS5, '123.45.678.910', '1080', True, 'username', 'password'
))
client.start()

Outcome:
Am I logging in correctly? New proxy, purchased here (IPv4 China)