Had the same Problem after an import from my android phone with the CardDav app.
After an app update I couldn't repeat the error with the \r.

To clean up the \r log in on the SQL Server an execute the following code:

UPDATE sogouseradressbook set c_content = replace(c_content,'\r','') AND c_lastmodified=1374216750
(be sure to update the timestamp)

Be carefull with the sql command and always to a backup first.

I can't really reproduce that "issue". I've imported the LDF using v2.1 and I get:

sogo=> select c_content from sogosogo10002507fc48f where c_name = '630A-5245E480-3-375D6E80';
c_content

BEGIN:VCARD\r +
UID:630A-5245E480-3-375D6E80\r +
VERSION:3.0\r +
CLASS:PUBLIC\r +
PROFILE:VCARD\r +
PRODID:-//Inverse inc./SOGo 2.1.0//EN\r+
EMAIL;TYPE=work:person@domain.com\r +
END:VCARD
(1 row)

dav:/SOGo/dav/sogo10/Contacts/personal/> cat 630A-5245E480-3-375D6E80
Displaying `/SOGo/dav/sogo10/Contacts/personal/630A-5245E480-3-375D6E80':
BEGIN:VCARD
UID:630A-5245E480-3-375D6E80
VERSION:3.0
CLASS:PUBLIC
PROFILE:VCARD
PRODID:-//Inverse inc./SOGo 2.1.0//EN
EMAIL;TYPE=work:person@domain.com
END:VCARDdav:/SOGo/dav/sogo10/Contacts/personal/>

which is perfectly fine.

Have you tried to download the vCard with a browser? I've received a couple of reports about that.

https://github.com/inverse-inc/sogo/commit/29dfc75fe94ddbbae012d729eb2d020b953dac27