Need help in fixing symfony 4 project leaking events to all mercure subscribers

I'm currently in building a chat application using symfony and mercure.rocks as a transport to send events between users and server.

1. Here is the event which is sending all the chat messages between users and room messages ----------

2. Here is our stage server(developer testing environment) ---------- , you can login using any guest account name and you will get 5 rooms to login.

3. The main problem is, if an user logs into the First room and stays in there, and then the other user who logs in the 5th room the event sent to all subscribed users in the chat, but not the people in the 5th room,. If you think this is confusing i can explain through screen sharing or voice call.

4. The main topic is, if a user is subscribed to one particular ROOM, he should get event only belong to that particular ROOM topic, but right now it is getting events and messages from all the subscribed events in chat application.

5. This job will be a task based job, and fixed price job, price will be negotiable. But i won't agree with HOURLY based job because i dont want developer spending time reading the documents of mercure.rocks after agreeing to the job.

6. I may sound harsh, but to be honest im a desperate man in need of fixing this issue which is critical and i dont want running around here and there after hiring the developer.

7. I will do my best to provide you a test environment where you can test the application run it, and you will get access to the github project to take a look.

8. Screenshot attached video shows an user receives events like fire from HELL from all un-subscribed rooms and topics.

9. Detailed screenshot shows, 1, user subscribed to topic TAMIL, but the users are receiving some other topic events in the number 2 arrow.

10. Price is negotiable. Do counter offer.