My CRON Job returned an error that CRON job did not work. In that this was there:
Set-Cookie: PHPSESSID=2t2drultihqc
I think you are using session_cache_limiter before calling session_start. If argument is private or no-cache the result is setting the Expires header to the time you have mentioned. Refer to this document for more information.
session_cache_limiter
session_start
private
no-cache
Expires