Recording Issues Cubase 9

Hi Guys,
When I record track 1 instrumental and playing back track 1 to recording vocals in track 2 the instrumental in track 1 is re: recording in track 2. What can I do. I tried a number of stuff but no success.

Hi and welcome,

What Audio Device do you use, please? If you have any Steinberg Audio Device, make sure Loopback is disabled, please.