Secondary Horizontal Axis Wider than Primary Horizontal Axis

Hi,

I am using excel 2010 and on a chart have two horizontal date axes, one primary one secondary. Now the problem I am having is that although the settings on both the axes are exactly the same including the Max and Min values etc the secondary horizontal axis is two notches wider than the primary horizontal axis creating white space on both sides of the chart. I have also attached a jpeg showing the same.

Any ideas what could be causing this?

Thanks

The Line series is defaulting the axis to have a Position between tickmarks.
Area charts normally have a position on tickmarks.

Simply format each axis to be positioned on tickmarks.