You're adding what anchor? Widgets have built-in anchoring, and it doesn't touch the transform scale. Nothing does. The anchoring changes the Size property of the widget and adjust the transform's position. Select the UIRoot, ALT+SHIFT+P -- this forcefully resets all scales to their default correct values of (1, 1, 1).
When working with NGUI, the same as Unity's UI, you need to be using the Rect transform too (T shortcut). If you're using W (move) and R (scale), then you're using the wrong tools.