Ping deviation in OW

Hi guys. I got an interesting question about ping deviation. I got 2 ISP. With first one I got like 50-60 ping in game and about the same when pinging through CMD to EU1 and EU2 servers. I changed to second ISP to look if my ping could become better. So when I ping to EU1 I got 40ms and EU2 is 37ms. What I dont understand, why my ping is from 50ms to 60ms while I play OW? Why its not 37-40 like in CMD?

8 days and 0 answer from support??? Blizzard wake up! Seems like there is no customer and technical support at all. What a shame blizzard.