I have a UV Sphere mesh with displace and particle system modifiers in place. I gave the displace modifier a noise texture with the local coordinate and strange thing is that the mesh randomly deforms its shape as I move it around. This does not happen when I set to a texture other than noise texture.
If that happens while you move object in object mode, then its clearly a bug.
Object will continuously formed only if you move it in edit mode, or use Global coordinates.