Is this normal (to be expected)?

[___1___]

Hey guys,

My last 18,300 hands I'm at (.32) bb/100 at 10/20 (previously at 2.3 over 190k hands w/variance of 15.2 per 100).

I don't know the math (which is why I'm asking) is this normal? How likely is this to occur if my true winrate is ~2bb/100?

Just never had anything like this happen before which is why I'm asking...

___1___