When a wide chart covering lots of data is created a Secondary Axis is often
needed to show the Major axis on the right to reference the data close to that
position. Unfortunatly when you create it (and this needs to be done daily
because the values aren't saved (see bug #100655) the Secondary Y Axis has no
relationship to the values of the Major Y Axis, and these have to be redefined
manually by double clicking on the right Y axis. This occurs with line graph
charts of various types. I don't know if it occurs for all charts.
This is a major annoyance because it has to be done daily so that the chart can
be screen printed and posted elsewhere.
Recreation:
1.Create a Line graph chart with a long column of data (I'm at over 150 rows
currently). 
2.Select the Chart and Define the Major Axis, give it Ninimum=0, Maximum=500,
Major Interval=100. 
3.Select the chart, Select Insert -> Axes, and under Secondary Axes, check Y
axis. The Y axis appears with data that does not coordinate with the Major Axis.
4. Compare the default values inserted on the Secondary Y axis with those on the
Major Axis. They default to Minimum=0, Maximum=12, Major Interval=2, which does
not coordinate in any way with the Major Y Axis. This should coordinate and get
its default values from the Major Y Axis.