Problem with ga boundaries

[George Kousiouris]

Hi,

I have started using the ga function of octave (package ga-0.9.4) but 
for some reason, around the 37th-38th generation the variables take 
values beyond the specified interval (0,1). Can anyone help me? Am I 
doing something wrong?

Here is the ga script used:

% Fitness function
gen=0;
save generation_number.m gen;
fitnessfcn = @script;
% Number of Variables
nvars = 19;

A = [];
b = [];

Aeq = [];
beq = [];
% Bounds
LB=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0];
UB=[1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1];

% Nonlinear constraints
nonlcon = [];

% Run GA

[x,fval,exitflag,output,population,scores] = 
ga(fitnessfcn,nvars,A,b,Aeq,beq,LB,UB)


Thanks in advance and best regards,
George