Why does E2 works 66 times per second while game itself runs 60 fps

[ghostserver10]

I dont know if I am writing this quiestion in correct place, but why does expression2 chips execute code 66 times per second? When making some control stuff it makes control unreliable and weird. And also how does it work 66 times. Like why does it need to run 1 additional tick after 10 ticks