Height Map doubles itself

[whitewaterwood]

When I make a height map (for example, a crater) when I use it to start a new world, it makes two craters, both now side-by-side ovals.

Is there a way to fix this?

[simsample]

That is a symptom of having the incorrect bit depth on your PNG image. You need to have 16 Bit greyscale- which means 16 bits per channel.
http://simswiki.info/wiki.php?title=Tutorials:Creating_Sims_3_Worlds#Custom_Height_Maps_.28Optional.29

[whitewaterwood]

Many thanks! :D