Yes, I too looked at the code and saw the \n hard returns. But in the database, they're turning into the zero (0) character between the options. For that, I have no explanation, but this is the second time I've had to fix it. The only time the list gets changed or in some other way affected would be through updates to your extension. Why the Address Title list would be affected, I have no idea.
I found a second drop-down list with the same problem; this time it's a list we created when we first set up the site almost 5 years ago. I haven't changed that particular list of values since I first set up the site. The values themselves are standardized license types dictated by the State of California, so we can't change them. Here's what was in the database:
dentist::Dentist::0hygienist::Dental Hygienist::0rdhap::Registered Dental Hygienist in Alternative Practice::0rda::Registered Dental Assistant::0rdaef::Registered Dental Assistant in Expanded Functions::0cda::Certified Dental Assistant::0uda::Unlicensed Dental Assistant::0dsaph::Dental Sedation Assistant Permit Holder::0oaph::Orthodontic Assistant Permit Holder::0udp::Unlicensed Dental Professional::0other::Other::0
Here's how I changed it to make it work:
dentist::Dentist::
hygienist::Dental Hygienist::
rdhap::Registered Dental Hygienist in Alternative Practice::
rda::Registered Dental Assistant::
rdaef::Registered Dental Assistant in Expanded Functions::
cda::Certified Dental Assistant::
uda::Unlicensed Dental Assistant::
dsaph::Dental Sedation Assistant Permit Holder::
oaph::Orthodontic Assistant Permit Holder::
udp::Unlicensed Dental Professional::
other::Other::
All I can say for sure is that something isn't working right within the extension. We're using a Bitnami Ubuntu stack on an Amazon Web Services instance. The specifics are below.
Setting Value
PHP Built On Linux ip-10-0-0-60 3.13.0-68-generic #111-Ubuntu SMP Fri Nov 6 18:17:06 UTC 2015 x86_64
Database Version 5.6.27
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 5.5.30
Web Server Apache
WebServer to PHP Interface fpm-fcgi
Joomla! Version Joomla! 3.5.1 Stable [ Unicorn ] 05-April-2016 22:45 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
We're current on all of the usual OS versions and libraries, as you can see.
Any ideas?
Toolie