Optimization using fminsearch and Montecarlo

I have an issue in optimization. I am using fminsearch and Montecarlo for optimization but get a different value for the same parameter to be optimized. Using fminsearch I get the optimized value as 0.46 whereas for the same parameter using Montecarlo i get it as 99999.9 I am defining the same range as the maximum and the minimum value. (0.00001 - 100000). Any idea where the problem is?