Optimization results when run GA with mixed integer

Dear all,

I have run ga in matlab with setting one of my four variables to be an integer then i found every time i run i will receive totally different value of an interger variable.

options = optimoptions('ga','FitnessScalingFcn',{@fitscalingrank }, ...
    'PopInitRange',[LB ; UB],...
    'StallGenL',10,...
    'Generations',100, ... 
    'PopulationSize',25,...
    'EliteCount',1, ...    
    'CrossoverFraction',0.6,...   
    'UseParallel','always',...    
    'MigrationInterval',10,...
    'MigrationFraction',0.1,...
    'MigrationDirection','both', ...
    'plotFcn',@gaplotbestf);
%Setup for use of the function ga for continuous variables
 %[X fval exitflag output population scores] = ga(FitnessFunction,nvars,[],[],[],[],LB,UB,[],options);
 
 %Setup for use of function ga for integer variables
 [X, fval, exitflag, output, population, scores] = ga(FitnessFunction,nvars,[],[],[],[],LB,UB,[],[1],options);
        

for example: first time

 X =

   10.0000    0.6548    0.0150    0.0200


fval =

    5.3928


exitflag =

     0

second time

     X =

    5.0000    0.6520    0.0150    0.0200


fval =

    5.3929


exitflag =

     0

As you can see the first value is quite different from 10 to 5 so i really have no idea which one i should choose even i run it many times or may be i have set something wrong please kindly help me

Thank you.