[Solved]These numbers dont make any sense to me

[Ray1981]

I dont understand I dont get the ZFW from FsP because I have disbled the load option by the dialoge. Then when I load passangers by the slides and put some payload by the slides below followed by setting my destination and start the flight. I get a screen (flight manifest) with some speeds but the ZFW has only XXX. I notced also that FsP always but 45000 lbs in the tanks which is maximum.
Very strangely I used approx. 30000 lbs for a flight from EGLL to EHAM and the same value for a flight from LFPG to UUEE. The first flight is only 232 NM and the latter 1365 NM.

As I tried to explain the numbers of fuel in the tanks dont match between FsP and my PMDG 737NGX.