Problems with Data Stream Fundamental Superbadge

can't find the field ‘International Contact' associated with the proper Data Stream or it isn't configured properly. on the Superbadge: Data Stream Fundamentals for creating custom formula 

believe I have added the right field with the formula: IF(sourceField['MailingCountry'] != "USA", "TRUE" , "FALSE") 

In the screenshots below I have a picture of how I am entering the field labels and then the other picture shows how the field is saving and changing the field label so it is not being picked up by the checker. Please could you advise how to fix this? Thanks