Debugger displays unevaluated expressions.

[DrD]

Maxheight2: 7.3894E-4/(1.0000/3.9600E3). Or (my favorite)
height1 =
1.0000+FLOOR(5.0000+1.55O0e2*(
1.0000-2.2150e-9/(1.0000/3.9600E
3)/(7.3894E-4/(1.0000/3.9600E3)))+
5.0000E-1)

if your code is using the "=" sign as above, try that again with ":=" like:

height1:=1.0000+FLOOR(5.0000+1.55O0e2*(1.0000-2.2150e-9/(1.0000/3.9600E
3)/(7.3894E-4/(1.0000/3.9600E3)))+
5.0000E-1);