Thanks for the notification. On examination, we notice that the Aug 15 departure was on time from New Delhi. The Aug 16 arrival of this train at Hyderabad is not mentioned in the Arr/Dep history at all. We try not to pull official data that is not fresh (updated more than 3 hours ago). This might be the reason that Aug 16 arrival was never registered in the Arr/Dep history, and there is a blank.
Hopefully, the above explanation helps, and our interpretation is correct. (i.e. Aug 15 train means Aug 16 arrival at Hyderabad).
Additionally,...
more... you may notice that the Aug 13 arrival (i.e. the Aug 12 train from New Delhi) at Hyderabad is also a blank. Once again, this might be due to extraordinary delay, and subsequent lack of timely updates.