When using the gizmo to scale a brush in the editor window, the Details panel “Brush Settings” do not update x y z.
Direct edits to the details panel are reflected in the editor window, but not vice versa. After editing the brush using the gizmo, any further edits to the Details Panel are out of sync and result in a “snapping” effect to the editor window object (since you are essentially guessing what the values were)
Windows 7 64-bit
UE 4.4.2