Mailer service provider here... We have regular problems with data coming from SalesForce users. Your software is intended to support only a single street address line. But against your advice, some people end up making a second custom address line. When this data is exported as a single address line - it throws an extra/bad line feed into the data that FUBARS everything when trying to use mailing software. The issue can be seen if you save the file as TXT and open it into a text editor.
What does the user need to do to export it correctly? I assume "Apt 3061" was entered as a second line - in the CSV you will see there is no space between the street and the apt.