Problem:
Timezone header data field comes double in the csv export.

Steps to reproduce:
I used Branch Analysis process on the stage.
1. Create a Flow Node Duration report grouped by Start Date:hour visualization as table

Actual result :
When I download the csv file, I see double startDate field in the file.

Expected result:
In the process you can see there is just one entry in April so we should see one startDate in the file.