When running a report which uses a Master-Detail relationship to display multiple charts, each chart is displayed with the same axis scale, regardless of the data.
By default, the product uses the same scale for all charts displayed via a master-detail relationship.
1. Click on the y primary axis line (the line just to the right of the
arrow pointing up from 0 to n)
2. Click on the Axis Range line in the properties pane
3. Click on the 3 dotted button to expand the options
4. At the bottom of the new window you should see the "Same range" check box. By
default it is checked. Un-check that box.
There are images attached indicating the typical output before the change as well as after. The example provided was generated using Go Sales (query) sample data. Please note the y-axis values in both images.