I was looking at my worker shift information and noticed that in a few shifts the, Inv Diff had a 0. Should I be concerned? 
How'd you get it to 0? i'm at .118% invalid and .170% block with 180th/s. I'd love me some 0 invalids!
He's talking about the Inv Diff column on the Workers/Shifts page.
https://www.kano.is/index.php?k=shifts
Love the overnight block action!
Right, I was referring to the "workers hourly shifts Inv Diff column", I am a bit less than .170 as well.