'multiple PHPSESSID cookies and browser doesn't keep any

I'm getting 2 PHPSESSID set cookies headers from a login request from my yii application.

Date: Thu, 05 Dec 2013 02:19:44 GMT 
Server: Apache/2.2.22 (Ubuntu) 
X-Powered-By: PHP/5.3.10-1ubuntu3
Set-Cookie: PHPSESSID=3lkhjlsv967n56horpcl3n7gl5; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT 
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 
Pragma: no-cache 
Set-Cookie: PHPSESSID=sctb6cd1snbd5g2esv1mn2lug7; path=/ 
Content-Length: 3 
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8

And browser doesn't keep any and doesn't send back them for future requests. Any idea how this is happening?



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