Mismatch between calculated answer from Comsol and Matlab

Anyone know why the result generated from Comsol (4.2) different from the result calculated by using Matlab?

I am doing 2D mode analysis for photonic crystal fibre, i draw and defined all parameters and set up in the Comsol, then i run it to get the result (effective refractive index).
After that, i saved the comsol as M.file and run the M.file without any modification.

both the answer is not the same...
why????

anyone can give me some possible solution?

thanks