After using once, water builds up on top of my yoghurt. Is this normal? | De Winkel Yoghurt

Yes, this is completely natural and occurs in yoghurts that are not stabilised with starches and gums. It is natural whey separating from the yoghurt once the curd (yoghurt) is disturbed. Simply stir the yoghurt well, to recombine the curds and whey.