Total trip duration is completely wrong

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Consider the following planned trip:

https://abetterrouteplanner.com/?plan_uuid=928a1216-df7c-43e6-bad6-b7b3a00bc966

The total duration is displayed as 21 h 5 min for 566 km with 3 stops, with a total of 5 h 19 min of driving and 46 min of charging. The total duration makes no sense. It should be 6 h 27 min instead.

I tried several other trip parameters and the total duration is still completely wrong.