Twitter card validation issues


#1

when i validate two following urls within the same website ,

One is :http://community.vodafone.com.au/t5/Vodafone-Blog/Now-you-have-it-the-largest-4G-international-roaming-network/ba-p/318495

The other one is :http://community.vodafone.com.au/t5/Vodafone-Blog/Software-Update-Weekly-Wrap-20th-February-2014/ba-p/319125

The first passed the validatiton ,but the second one failed.please advise why this happens.Thanks a lot .

Bowen