Ga toolbox answers optimtool

Hello Friemds, I have solved small classroom examples in gatool box using ga and gamultiobjective. I got the answers but when I prerss start tab again, it gives different answers for the same problem. Also after solving gamultiobjective problem, we get no of objective function values and corresponding value of the variable x. Form these how to find out the single values for both the objectives. Like in Lp we get only one value of the objective function.