Why does the ga in matlab doesn't stop even after attaining the fitnesslimit?

I am using the ga in matlab. I fixed my fitnesslimit as 1 in the options. Even when my function evaluation is less than 1, it still goes on.

Sorry, I can't post the whole program here, so just posting the important lines of the program.

    options = gaoptimset('InitialPopulation',x0,'PopulationSize',popul_size,'EliteCount',8,...
    'CrossoverFraction',0.25,'Generations',no_gens,'FitnessLimit',1,'PlotFcns',{@gaplotbestf});
    [x_best,fval] =ga(fitnessfcn,nvars,[],[],[],[],lb,ub,[],options);

[Walter Roberson]

One way that can happen is if there is a constraint violation: it could continue to search looking for a point that met the fitness level but did not violate the constraint.