World Composition - Tiles vertically (?)

when I import landscape tiles from World Machine to World Composition in UE4 I see followig screen:

What’s going on?


How many tiles you are importing? Is it one loaded landscape tile on the screen or several?
Could you attach your heightmap tiles here?

441 tiles. One landscape with proxies. Heightmap tiles:

The problem was with tiles that has only one component in it. This is fixed in main

If you export your heightmap tiles with a bigger resolution like 1017 or 1009, importer will create more than 1 component per landscape tile, so you can avoid that issue.