Steps to reproduce the problem:

1. Create a filter so called ABC
2. Add any column to the ABC filter such as below:
   
   I had drag a new column (Description) next to the Key column.
3. Navigate to the dashboard and click on the filter total number:
   
4. Bring us back to the filter column view:
   
5. Change this to "My Defaults" to display the columns that I do want:
   
6. Export Excel (Current fields)
7. Shows the description in the spread sheets.

Expected Results:

Export Excel should follow the 'My Default' Columns view instead of Filter view.

Actual Results:

Export Excel is referring back to the Filter view after did any changes in the 'My Default' Columns view.

Workaround:

Copy the whole JQL query and paste in a new page and then export the excel out.

Futher finding:

After change the column view and click search, it will revert back to the Filter Views.