problem with Lumerical Mode Solution for PCF

hi, I have a serious problem!
I want to simulate Dispersion-Wavelenght Curve of a Photonic Crystal fiber & Used Lumerical Mode Solution Software.
finally I Simulate it & got a Curve, but I know it's false! I study various types of books & Journals and know that my result it's not true, look at it :

I want to know what is problem? why my simulation is false? all of my parameters is equal to journals curve, but my simulation reslut is wrong!