Air India Express — Difference in fare

Address:	Ludhiana, Punjab
Website:	book.airindia.in/itd/itd/lang/en/prg/datePriceLedJourneyCalendar

I am senior citizen eligible for concession on domestic flight when i tried online to book ticket for return journey from delhi (Sept.16, 2016) to mumbai (Sept.18, 2016)
Following is the detail of return fare with concession and without concession :-
The following table shows a breakdown of the return fare for each traveller type.
Senior citizen
Base fare per traveller inr 24, 586.00
Total taxes per traveller inr 1, 477.00
Total charges and fees per traveller inr 1, 795.00
Total per traveller inr 27, 858.00
Number of travellers 1
Total inr 27, 858.00

Price breakdown per traveller type
The following table shows a breakdown of the return fare for each traveller type.
Adult
Base fare per traveller inr 4, 234.00
Total taxes per traveller inr 256.00
Total charges and fees per traveller inr 1, 795.00
Total per traveller inr 6, 285.00
Number of travellers 1
Total inr 6, 285.00
Total price including taxes inr 6, 285.00

How funny concessional fare for senior citizen is
More expensive by 21, 573 /-

Any body could explain the reason???