I have no idea. It is the first project and first level where I make any terrain and foliage and it happened once for now.
I’m using the usual way of painting foliage. Here and there I selected painted foliage object and adjusted them a little. I made use of various painting settings like Z Offset, Radius, Scale and Align to Normal.
I noticed now that the foliage objects of one 1 specific terrain component are floating above the ground. The foliage objects on all other terrain components are not corrupted.
I assume the foliage positions are baked inside a texture per terrain component? Can I access that texture somewhere?
I tried to use the lasso tool to grab all foliage objects of that terrain component and see If I can move them all back at once but it seems there is another bug with the Lasso tool: Foliage Lasso select doesn't work - World Creation - Unreal Engine Forums