App formula for column in parent table only updates when that specific record is re-saved

A column (Total Order Value) in a parent table (Customers) uses an app formula to sum up values in the child table (Orders) that are related to that customer. 

The values are only updating if I edit and save the Customer record. Is there a way for these to update whenever change is made in the Orders records?

Sorry if this is answered somewhere else.

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