Reports that group by the number of incidents and use the OR operator on tags show an incorrect number in the header

Reports that use the OR operator on tags and group by the number of incidents do not show the correct Group by number in the header.

1. Navigate to Incident > All.
2. Open four incidents in different tabs.
3. Add a tag to each incident by clicking the More options icon  and selecting Add Tag.
   • In the first incident, add tag named Test1
   • In the second incident, add tag named Test2
   • In the third incident, add tag named Test3
   • In the fourth incident, add tag named Test4
     
     
     
     
4. In the original tab (from step 1), navigate to System Definition > Tags.
5. Ensure that the tags you created have Global set to true. If necessary, set them to true in the list view. 
6. Navigate to Reports > Create New.
   • Table: Incident
   • Troup by: severity
   • Condition: [Tags] [Test1] or [Tags] [Test2] or [Tags] [Test3] or [Tags] [Test4] 
7. Click Run.
   Note that there are four total incidents in the list, however the Group by count is showing 26.

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