That is a problem with the bort number system itself, I believe.
The bort numbers on the nose and the refueling door use the same texture or the same line to call it, except for the first digit of the 4 numbers on the nose.
So having gray numbers on the refueling door will get you 1 blue number and 3 gray numbers on the nose.
Similar problem with the RoughMets for the nose, as the numbers overlap two textures. Then you can't get RoughMets for dynamic numbers, etc. etc...
Could be that I'm going duum dumm and missed something or the bort number system for the F-16 is really sketchy.
So I went for the numbers on the refueling door, so far until I see a fix or someone enlightens me.