Drop down report control not working properly

In my dashboard the drop-down list control is not working correctly. In the control there are two options. If you select one of them the dashboard shows the right data. If you select both options the dashboard shows the right data but the control deselects one of the selected options. This is very confusing cause the dashboard is showing data with both selected, but the control shows something different. Someone any idea how to solve this? Already added the control again.

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