"Rect" of button shows wildly different X,Y coordinates in build

When I run the game in editor doing:

button.GetComponent<RectTransform>().rect

give me what appear to be "valid" coordinates for the X/Y coordinates of the button (something like 71, 22). However, when I run the game as a build, the X/Y coordinates return as something like -80, -410.

Any clue why this might be happening?

Thanks!