Fuel used (shown on MFD) of Pilatus PC12 is completely off

The fuel used fuel on the lower MFD is completely off and does not correspond with the actual fuel burned at all. Instead of a value of around 280 lbs, I see 2020 used, which is unreal since aircraft was only loaded with 990 fuel when departing.

Hm, had some flights where the values seemed correct as well, so a bit of a weird one with that value