c# event handler is called multiple times when event is raised once

Question

Below is my code, first is where I raise the event and second section is where I consume it in another class. It seems pretty straight forward, but the logs are showing that

Answer 1

Try this, this will unregister any prev subscriber:

ibSerialPort.OnPacketReceived -= ibSerialPort_OnPacketReceived;   // unregister
ibSerialPort.OnPacketReceived += ibSerialPort_OnPacketReceived;  //register