Split landscape heightmaps - Single flowmap applied to entire landscape

Hey guys. I really hope somebody has an answer because im about out of ideas. I have a 6x6 tile (2017 res) landscape from Gaea. I used split instead of tiled and finally my flowmap at least is visible on the landscape. But when i select the first one in the folder, indtead of applying thr 36 flow heightmaps to the landscape, it uses 1 single heightmap snd stretches is across the entire landscape.

Using png16 maps
Range = Raw
Xx/yy (not yy/xx)
Default settings in Unreal landscape editor.

Does anybody know what might be causing this issue? Ive scoured the internet for almost 2 weeks for an answer.

Anyway, if you need to see sny screenshots, please ask. Thanks a lot guys!