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Calculated Value on form concatenates instead of adds

Question asked by cbeene on Dec 11, 2015

I'm trying to add several fields being entered into a form.  I'm entering "10" into the fields to test.  If I enter 10 into 2 of the field and leave the other blank (" " not "0") sometimes I get "1010" instead of 20.  And even that depends on what field it is I leave blank.  Is this normal?  Do fields need to be "0" to not cause a CV to error?

 

I'm doing this in Nintex forms for Office 365 if that matters.

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