How come my prototype doesn't start on first screen?

I have created a prototype and have ensured the little blue square is on the first screen, however when I create a link for the prototype it’s not starting on the correct starting place. Is there another reason besides the blue square this would happen? If so, how do you fix it?

The first flow is indicated as ‘Flow 1’ so make sure it its on the screen you want. Try visiting this link but if that doesn’t help take a screenshot of it here.