Double Parenthesis (in Red) in Reports

Hello, 

This may be a very basic reporting question and better suited for the "Ticketing and Customer Service" forum. 

For the Ticket Sales by Period report (Category: price type), there are numbers in red with a double parenthesis (see below). Does anyone know what this indicates? 

I thought it may be related to exchanges, however, this only reflected in two of the performances.

Thanks! 

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