Hello @NathanM07537 ,
Contact details won't be able to show up during test sends because test send don't pull contact info, especially since they can be sent to technically any email address. It will always default to the account owner's contact fields (so what you have listed as in your "personal notes" for your own contact), or the secondary option if applicable / allowed. Selected contact details can only show up in live sends, as those will pull from the actual contacts themselves.