Exported landscape heightmap distorted

Hey! I’ve been starting to learn Unreal 4 after learning Unity… Trying to get a terrain done and I’ve been sculpting for a while.

I wanted to export a heightmap of the terrain, and found usefull stuff about the gizmo tool & copy pasting stuff.
However, when I try to export the terrain’s heightmap with the gizmo tool, I only get a distorted and unrecognizable mess out of it.

Does anyone have any idea what I’m doing wrong? Maybe my terrain is too big or something?

228389-ss-2018-01-25-at-045157.png

My landscape resolution stuff

Me using the gizmo to copy the data

Distorted mess that should’ve been the heightmap