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360LDEV360LDEV 

Rollup Summary field with odd value in database

Hi all, 
I just identified a weird behavior on a Rollup Summary Field. When I remove all the child records it's summarizing, the rollup summary field value should be 0, but instead the field's value is 4e-40 in the database (in the UI, $0 is displayed), which makes no sense ! I've spot another example with another value : 4e-35. 
Further details about the concerned field : 
 - Data type : Roll-Up Summary 
 - Summary Type : SUM
 - Summarized object : Opportunity Product (from Opportunity)
 - Field to aggregate : a custom currency field.
Our Active currencies are EUR, GBP and USD, our corporate currency is EUR and the concerned records are in USD.

Anyone has already experienced this? How could I fix that? 
Thanks for your help !