HELP...I hear my DI guitar along with my amp sim

I hear my DI guitar along with my amp sim in Cubasis 3. Even if the monitor button is off, I still hear my guitar as I play “live”. When I engage the monitor button, I hear my DI along with my amp sim at the same time. How do I make it so I only hear the amp sim? My recordings are only amp sim even though I hear both at the same time as I’m recording something. Also, no channel signal when the monitor button is not engaged. My interface is a Steinberg UR44C. I am also recording on my iPad.