I've never run into this particular problem.
Having said that, it's possible it's a setting in your default flight. If you do not have the sim's default, default flight, can I suggest resetting it so that it is? Make sure the Unlimited Fuel is unchecked. IE: You want the default settings for the default flight.
Make sure they're set in the sim's .cfg file, too, just to be safe.
THEN, once the default flight loads in totally, change to the location, and plane, you want.
I don't promise this will solve the problem, but it's worked in any number of other, similar, situations. Worth a try, and easy enough to reset everything to your desired choices after checking it out, no?
Good luck!
Pat☺