Change height of an inset extrusion I'm trying to change the height of an inset extrusion on a block mesh, but the object is distorting when I attempt to change the height.  Below is a snap of two block meshes.  Each has an inset of the top face, and an extrusion of the inner face.  One is up, the other down.  

I can change the right object's top face (G then Z for the height), with no distortion to the cube.  However when I change the left cube's lower face the entire cube distorts.  I need to do small adjustments to the inner surface depth only. 

Before


After
You have proportional editing (O) enabled:



Disable it by pressing O again or selecting disabled in 3D view > Header.