Indian Railway Catering & Tourism Corporation [IRCTC] — Less payment received upon ticket cancellation

Address:	560045
Website:	irctc.co.in

I cancelled the following railway tickets booked by me from my id on irctc.Co.In :
Pnr : [protected]
Pnr : [protected]
Pnr : [protected]
Pnr : [protected]

As per irctc website, ticket cancellation charges for ac 3 tier confirmed ticket is rs 90 per passenger. However, rs 205 per passenger has been deducted as the cancellation charge by irctc for pnr [protected]. This was a confirmed ac 3 tier ticket booked by me.
Similarly, for waitlisted ticket pnr [protected], cancellation charge of rs 80 has been charged per passenger. This was a waitklisted ticket in ac 3 tier booked by me.

Also, for my other two tickets bangalore to mumbai, pnr [protected] and [protected] which were booked in ac 3rd tier and were in status rac and confirmed respectively, different amounts have been deducted as rs 90 and rs 205 respectively.

I want to know why different amounts have been deducted as cancellation charges for me when the cancellation charges for confirmed /waitlisting tickets are fixed.

Note : all these tickets were cancelled 9 days before the date of journey.