SOLVED Else and else if doesn't work correctly when using in "When this GUI opened" or "When this GUI closed" procedure

I made coin bag, when you open it's GUI it should do that:

if random(0,1) < 0,5 play sound1, else if random(0,1) > 0,5 play sound2, else play sound3. 

But instead of doing that it just plays all of them, why? Am I doing something wrong?