Landscape texture with mapping causes weird effect on long distance.

Hi and sorry im a new guy at Unreal Engine, i tried to follow the steps of a tutorial to apply material on a landscape, however i get very weird visual effects. Up close it actually looks nice and just how i wished, but over long distance i get i dunno an AA problem ? I tried to google the problem, but haven’t found anything to match my problem and i decided to join the forum for help.