Terrain full of slopes and not flat when loading a project. Closing the projects and re opening them is a workaround
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I would love to know how to stop this, but I never have. It's been doing it since the sim launched.
Sometimes I have to waste 5 or more hours returning the terrain to something like normal, and it still looks worse than the original unmodified version. It varies from site to site.
You could try adding and then deleting a rectangle which in some cases instantly returns the terrain to normal. It doesn't always work though.
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