Just attach the workbook we can have a look to give a solution!
Can you move and see the one you wanted upper?
Unfortunately I cannot attach my workbook in so far as I work with OLAP cubes
If I understand you correctly, you want to show the Right side visual above the Left side visual, just remove/ de-select the Dual Axis from the Right Side one and it would sit one on the other.
Else, I am afraid you need to mock your data using Excel and come up with a workbook or bit be more elaborate to look at it. I am otherwise hopeful the above would resolve.