UR22 output turned down not silent

well the title pretty much says it.
When i have the output of my ur22 turned all the way down, there is still a little bit of sound coming from my speakers. Is this normal?

also when i turn the mix knob all the way to input, I can still hear some audio thats playing from my pc. It is very quiet but it is noticable.

same goes for the headphone output.