Group headers get mixed up

When I'm trying to change the order of grouped columns in the group area, the group headers in the grid get mixed up.

For example:

I group by 2 columns: Status & Mode – Everything looks ok.

When I change the order of the grouping by dragging the 'Mode' label in the group area, the group headers get mixed up, and I get the following groups:

'Status_1'

'Mode_2'

'Status_0'

 I think it has to do with the fact that I implemented the Loaded event of the GroupByRecordPresenter.

I did it because I needed to change the text of the group headers.

For starters, by default the group header display the value followed by '(n items)' where n stands for the number of items, and I needed to change that. (I wanted to get rid of the 'items' part).

1. Is there a way to fix this problem?

2. Is there different way to achieve what I wanted (without implementing the Loaded event of the GroupByRecordPresenter)?

I'm attaching a sample that demonstrates the problem.

(To see the problem, group by 2 columns and then switch the order between them).