Setting axis position sometimes requires entering the command twice

I have been having a problem when trying to set the Position of a Figure Axis. I will set it the first time with 'Units' set to 'Normalized':

ax.Position = [0.1 0.15 0.55 0.8];

The axis is incorrectly resized. If I reenter the same line of code, the axis becomes correctly sized. Regardless of how many times I reenter it, it is the correct size.

Any ideas? Thanks!