Charging times Kia EV6 inconsistent

I have noticed that the charging times of my Kia EV6 LR (2022 model) are inconsistent. I am seeing that in this example sometimes charging 10-80% takes only 19mins, and sometimes 30mins. This while chargers are 350 or 400 kW but my Kia does max 240kW, so there should be no limitation on charger side.

See example and attached screenshot:

https://abetterrouteplanner.com/?plan_uuid=2-6a1fc4de-84ab6e070d91d2431fab5f88

Is there an explanation for this? In ny latest long trip, every time charging at Ionity just gave me max charge speeds on the charge curve.

Thanks!

Roel