Charge time calc wrong ?

Hi, I´ m just planning a route and ABRP has choosen a 300kW station and is telling me, that it will get 21,2 kWh in 47 Mins. That equals an average charging power of 27 kW. The station has 300 and my car takes up to 85. Getting at least 50 is a normal thing which would mean just the half of the calculated time. Where does that mismatch comes from ? Regards Wolfgang