PostgreSQL error: FATAL: password authentication failed for user "pgadmin" - postgresql

Question

I am making a Telegram bot with a PostgreSQL database. Everything works correctly on the local computer, but when I upload the code to the server using docker-compose, the following errors appear in the console from time to time:
2021-10-10 02:08:58.865 UTC [3458] FATAL: password authentication failed for user "pgadmin"
2021-10-10 02:08:58.865 UTC [3458] DETAIL: Role "pgadmin" does not exist.
Connection matched pg_hba.conf line 94: "host all all 0.0.0.0/0 md5"
2021-10-09 16:27:22.198 UTC [2259] FATAL: password authentication failed for user "pgsql"
2021-10-09 16:27:22.198 UTC [2259] DETAIL: Role "pgsql" does not exist.
Connection matched pg_hba.conf line 94: "host all all 0.0.0.0/0 md5"
2021-10-09 16:25:16.113 UTC [2250] FATAL: password authentication failed for user "postgres"
2021-10-09 16:25:18.992 UTC [2252] DETAIL: Password does not match for user "postgres".
Connection matched pg_hba.conf line 94: "host all all 0.0.0.0/0 md5"
2021-10-09 21:06:32.169 UTC [2831] FATAL: expected password response, got message type 0
2021-10-09 21:07:39.610 UTC [2834] FATAL: unsupported frontend protocol 0.0: server supports 2.0 to 3.0
2021-10-09 21:07:39.819 UTC [2835] FATAL: unsupported frontend protocol 255.255: server supports 2.0 to 3.0
2021-10-09 21:07:40.029 UTC [2836] FATAL: no PostgreSQL user name specified in startup packet
And I don't use these users. It seems to me that someone else is trying to access the database. If so, is it possible to somehow specify the IP addresses from which traffic will be allowed? But my bot parses sites, so you need to limit the IP so that it would not affect its work. Thanks!
UPD:
As I was prompted in the comments, maybe the contents of the docker files will help
Dockerfile:
FROM python:3.9.5
WORKDIR /src
COPY requirements.txt /src
RUN pip install -r requirements.txt
COPY . /src
docker-compose.yml:
version: "3.1"
services:
steamtrader_db:
container_name: steamtrader_db
image: sameersbn/postgresql:10-2
environment:
PG_PASSWORD: $PGPASSWORD
DB_USER: $PGUSER
DB_PASS: $PGPASSWORD
DB_NAME: $DATABASE
restart: always
ports:
- 5432:5432
networks:
- steamtrader_botnet
volumes:
- ./pgdata:/var/lib/postgresql
steamtrader_bot:
container_name: steamtrader
build:
context: .
command: python bot.py
restart: always
networks:
- steamtrader_botnet
env_file:
- ".env"
volumes:
- .:/src
depends_on:
- steamtrader_db
networks:
steamtrader_botnet:
driver: bridge