Form 26as tds amount changed

Kaustav Das (Student) (48 Points)

28 July 2014  
I do my own e-filing and I'm stuck with a problem. I'd really appreciate your help to solve my problem.
 
I e-filed form ITR-4S (original late return u/s 139(4) for AY 13-14) in May'14 & got my refund in June'14. But, in the meantime, I noticed yesterday in my form 26AS that the amount of TDS refundable has increased. Does that mean that my tax deductor was late to file their return? What should I do now to claim the excess refund amount?
 
Please advice me.