Too many redirects when not logged in

I was looking what causes my CV calculator tool to return invalid values when I detected that the site is inaccessible if you don't have a valid sessionID cookie.

The old behavior was to send you a 302 with your "guest" sessionID as long as you didn't send a valid sessionID. Once you did that, the webpage loaded without a problem.

Now it just doesn't accept any of the sessionID you pass

EDIT: Here is a log of the connections

knsys@server:~$ nc www.steamgifts.com 80
GET / HTTP/1.1
host: www.steamgifts.com

HTTP/1.1 302 Moved Temporarily
Date: Mon, 02 Feb 2015 11:23:03 GMT
Server: Apache
X-Powered-By: PHP/5.4.17
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=e70f9d9d74fae1b5fdbade9d7552629ed1a5a85725667bd170c21ee2d3c94ab38e9c18466dcf29d91b4adbea6d4caaad5c5c4483bbf1146d6ec2b9180da99204; path=
/; domain=.steamgifts.com
Set-Cookie: PHPSESSID=d09d892ab6c6a06a61de4cccb7265f60bb67a70d4651a86b1b93477c924519bffe5954915a446f1037fd4126a377d12fffd66adcdfdb9814fe772523fffc4a74; path=
/; domain=.steamgifts.com
Set-Cookie: PHPSESSID=d09d892ab6c6a06a61de4cccb7265f60bb67a70d4651a86b1b93477c924519bffe5954915a446f1037fd4126a377d12fffd66adcdfdb9814fe772523fffc4a74; expir
es=Mon, 09-Feb-2015 11:23:05 GMT; path=/; domain=.steamgifts.com
Location: /
Content-Length: 0
Content-Type: text/html; charset=UTF-8

knsys@server:~$ nc www.steamgifts.com 80
GET / HTTP/1.1
host: www.steamgifts.com
Cookie: PHPSESSID=d09d892ab6c6a06a61de4cccb7265f60bb67a70d4651a86b1b93477c924519bffe5954915a446f1037fd4126a377d12fffd66adcdfdb9814fe772523fffc4a74;

HTTP/1.1 302 Moved Temporarily
Date: Mon, 02 Feb 2015 11:23:17 GMT
Server: Apache
X-Powered-By: PHP/5.4.17
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=5a325027dc497063799f3548d2df37b8a0963f27a0546a45d1cbe326edee9165d4572c601fe1afd8a148f91c242be37ff6637503be770324ea8444f713fb3a31; path=
/; domain=.steamgifts.com
Set-Cookie: PHPSESSID=5a325027dc497063799f3548d2df37b8a0963f27a0546a45d1cbe326edee9165d4572c601fe1afd8a148f91c242be37ff6637503be770324ea8444f713fb3a31; expir
es=Mon, 09-Feb-2015 11:23:30 GMT; path=/; domain=.steamgifts.com
Location: /
Content-Length: 0
Content-Type: text/html; charset=UTF-8