Decided to take a flight from LGSK (Skiathos) to LSZH (Zurich) in a Ryanair 737-800.
The generated plan:
LGSK has a relatively short runway of approximately 5000 meters.
After loading my passengers, I tried to do a takeoff calculation using the PMDG tablet which promptly threw an error of the aircraft being overweight. I then tried to do a takeoff calculation using simbrief which resulted in the following image:

Thus my belief is that this is a bug…?

