Smooth Landscape,Breaks LS Normals Completley

Hey !, I have an Problem when i Smooth my Landscape with Sculpt Tool,it Breaks my Entire Normals of the Landscape… any ideas? (Its just an Dynamic Project)

Would be Nice when Someone have an Solution.

Thanks!

https://puu.sh/z8EPb/e6b2f10ccf.png

Really, No one have an Similar Problem?, on just an Dynamic Project?

For More Information, my Landscape Material is Not Based by Angles, or DIfferen Things/Only LERP) , FORCE NO PRECOMUPTE is Enabled in Worldsettings,

Need really Help, Thanks!