Although it is annoying it is not unexpected/abnormal.
According to specifications those sensors should have a Relative Humidity Accuracy between +-2 (typical) and +-3 (maximal) at 25ºC.
Theoretically they could be anywhere between 4%(*) and 6% apart and still performing according to spec.s.
(*) Say the "real" humidity is 50%. Sensor A overreads 2% and shows 52%, sensor B underreads 2% and shows 48%.
To improve accuracy, perhaps one could use both and average the reading
According to specifications those sensors should have a Relative Humidity Accuracy between +-2 (typical) and +-3 (maximal) at 25ºC.
Theoretically they could be anywhere between 4%(*) and 6% apart and still performing according to spec.s.
(*) Say the "real" humidity is 50%. Sensor A overreads 2% and shows 52%, sensor B underreads 2% and shows 48%.
To improve accuracy, perhaps one could use both and average the reading