Expected state:
Duplicated process = Unless grouped by process, duplicated instances are not counted
Group by process = Instances from all copies are displayed as individual instances 
Filter individual copies = Filters are only applied to the specified process copy

Bug: 
Filter application is incorrect and inconsistent depending on the filter type. 
See example screenshots. 

To reproduce: 
• Create a process instance count bar chart report. 
• Duplicate the process definition, group by process. 
Result = Two bars displaying total instance counts for each copy. 

• Add instance state filter on one process copy
Result = No effect in instance count for that process. 

Please test other filter types to view other filtering issues.