possible evil box glitch?

It is just luck, it is really that simple. There is no glitch.

I don't think luck can justify getting accessory attack/chaoses/pet attack scrolls in the first hour and then getting only accessory dex 60% for the other 8 hours. That makes no sense whatsoever, I actually collected the result from 2 days(total of 15 hours for both days together), same thing happened yestoday after I left only 1 inventory open and then I started getting only acc dex for the rest 4 hours. So I doubt it's luck