@W3DUK This looks like its because you didn’t add YOUR exchange information in the ‘My Exchange’ field underneath the ‘log contact’ button. Add this information and then re-export your cabrillo or adif.
For every contest you’ll need to add your exchange information in this same spot.
Ahhh. I didn’t even see that there until you mentioned it.
Perhaps it would be a good idea to remove it from the logbook settings to remove any confusion in the future.