Not sure when this happened, but anyone with an international Address (not United States as the country) appears to have a "blank" address in RE NXT when you are looking at it. The address will read " Address block left blank" but that's not really true. If you click on the pencil (edit) button the fields WILL fill in correctly. This is a pretty basic BUG in NXT.
This sounds like you haven't built an address block in config > international for that international address.
Here are a couple of articles relating to this
The address doesn’t show up in web view, but it is visible on the constituent’s record in database …
Address Block is blank on a constituent's address record
Hi Thomas, I'm having someone on the team take a look. If it is a bug, we will close out this idea and file a defect to fix. Thanks for pointing this out.
Trit Mulligan