Landscape from heightmap issue

Hi guys!

I have a very frustrating issue with unreal landscape, I’ve exported a map from mudbox in tiff 16bit, resized to 4033 in photoshop and save as png 16bit. My problem starts when I import this in to my map, after import all landscape look so jaggy, like dont have a smoothing group at all. I’ve tried every format png,raw16,raw but the result is always the same… Please help!