PivotGridControl is drawn incorrectly if ShowColumnGrandTotal property is changed

In the attached zip-file there is a solution & a screen-shot.
1. Run the app.
2. Drag the columns to the position of the screen-shot.
3. Drag the Discount column to the filter-area.
4. Scroll the table completely to the right.
5. Uncheck the button "Show Column Grand Totals".

As you can see in the screen-shot (and in the app), the column headers are shifted to the left, because of the hiding of the Grand Totals Column, but the columns itself are not.
And the fields in the filter-area aren't visible any more.

I couldn't reproduce it in the DevExpress Demo. I had to copy a lot of source files before getting it reproduced. But I think it is most likely, that it has something to do with the way the data is set in the RefreshData() method.

Do I have a wrong setting, or is this a bug?

Regards,

Alfons

Steps to Reproduce:

Run the attached project.

Scroll the PivotGridControl to the right.

Click Show Column Grand Total

Actual Results:

The XtraPivotGrid is drawn incorrectly.

Expected Results:

The XtraPivotGrid control should be drawn correctly