Handling message twice

[pavelpage]

    #[Handler]
    public function handleMessage(Incoming&Message $message): void
    {
        if (in_array($message->chatId, $this->notifiedChatIds)) {
           $this->service->storeNewMessage($message);
        }
    
    }

If I'm using this code, sometimes it stores the same message twice. Is it normal or not? Because, I cannot check why it handles the same message twice.
Of course, I can check the $message->id to prevent such kind of behaviour, but I want to understand, why does it happen.