Give it about 2 hours to settle down...it will probably have a different reading by then...are both troughs full of water?Almost an hour
Ideally, it should be setup and run for at least 24 hours before putting any eggs in it, to be sure it has stabilized but I understand the urgency!
With mine the inner most ring, when filled would hold the humidity at 45% RH. With both filled it would go beyond 80% . I would only partially fill the outer ring until I got a reading of 60 -65% RH for the final 3 days of incubation.