Monitor Cubase 9.5

Hello, having a bit of confusion with my monitoring function. Except I just constantly have a direct input of my instrument before Cubase is opened and during the software being open. Regardless of Direct Monitor tab being switched off it still gives off an input signal and when I switch it on it doubles over the input track then leaving it with the one I would like to hear and my original input underneath it. So when I am playing with my effects channel turned on I am also getting my original input layered over the top making a horrible latency effect… any advice on how to just make it so that I can only hear my instrument when I switch on direct monitoring.