Hi,
This is a problem with a Pivot chart. This issue can be resolved by editing the SERIES function of the chart. Refer to the following worksheets at this link - http://www.ashishmathur.com/control-graphs-with-check-boxes-and-scroll-bars/
- Solution II - Nonpivot (Form A)
- Solution II - Nonpivot (Form B)
In Solution II - Nonpivot (Form A) worksheet, you will observe that "No of customer" is plotted on the secondary Y-axis and toggling its visibility does not have any impact on the graph.
Hope this helps.