As you can see in the picture, the trees placed correctly are put there by hand and were not aligned, they were set as supposed, but the ones that are like stuck inside the terrain are made by the tree brush tool or the mass tree placer (same tree inside terrain problem), i’ve tried to change the position of the tree in cinema 4d but it didnt change anything
My best guess would be that the tree’s pivot is at that point on the ground. there is an option in the object settings (click on the object in your project) to change the pivot. Change it to “bottom”?