what do you guys think about the dt 770 pros for noise isolation and noise cancellation?

I just got them today. I use windows on volume 40%, and people can kind of hear what im listening to. Also, the noise cancellation is ok. You can hear stuff if youre not listening to anything, atleast for me.

Im kinda worried i got a defect or a fake. What do you guys think? Can other people hear what youre listening to?