Indian Railway Catering & Tourism Corporation [IRCTC] — Why catering charges are deducted even I chooses "No Food" - Tejas express 22672

Recently I booked a ticket in Tejas express 22672 (Madurai to Chennai). I opted for "No Food" for all the passengers.

But at the end of the ticket booking i have seen the catering charges as Rs 120/- is deducted for total 6 passengers.

Attached the ticket copy for your reference, let me know why these hidden charges ?

There is twice ticket is raised but there is no response more then 10 days.

Ticket Id:[protected]
Ticket Id : 13173012