Exported template result is not the same in XLSX and PDF

Short description: Exported template result is not the same in XLSX and PDF

Steps to reproduce:

1. Install this template in your Jira instance Xporter_Template.xlsx
2. Go to a test execution that has issues of type Test with different status and differents created date
3. Export the template installed in step 1 for xlsx
4. Export the template installed in step for pdf

Actual Result: The exported template result is not the same in XLSX and PDF. Sheets Testfall-Chart and Defect-chart in excel and pdf have different results

Expected Result: The exported template result should be the same in XLSX and PDF. The chart should appear with the same result in both formats.