Button moving away from Camera.

Hello,

I have set a simple script that makes the Camera move with WASD and rotate with IJKL. The Camera has a child object "Canvas", who in turn has a child object "Panel". On start a script attached to camera sets up dinamically a button on the top left of the panel. This button is necessary, as I need to have the GUI always on (think of it as the first System Shock).

However, when the camera moves the panel/button (not sure which one, as the coordinates are greyed out) moves slightly faster, causing it to go out of frame.

How can I fix that?