Your units and position are incongruous. If you use 'normalized' then all of the position values will (almost always) be between zero and one. This is explained in the axes properties page:
which states for normalized units: "Normalized with respect to the container, which is typically the figure or a panel. The lower left corner of the container maps to (0,0) and the upper right corner maps to (1,1)."
If (0,0) is the lower left of the figure and (1,1) is upper right of the figure, as the documentation clearly states, where do you think your axes lower left point (5.2,11.923) will be? (hint: waaaay outside the figure boundaries). And you specified the axes to be 19.2 times the width of the figure and 7.769 times as high: these axes are so huge, you would only ever see 0.67% of the axes inside the figure, even if you moved its lower-left corner so that it was visible.
Hint: if you are using normalized units then (0.5,0.5) is in the center of the figure.
