Ranikhet Express - रेगिस्तान में हरियाली

I have one question with respect to the cancellation of waiting list Tatkal tickets.
I got only zero refund for the cancellation of waiting list Tatkal ticket.
When contacted the irctc care,They say that the ticket is confirmed during chart preparation.
I have cancelled the ticket on the booking day itself.
I...
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dont know why they have kept the cancelled ticket as waiting list until chart preparation (which usually happens before 4 hours of the train departure) to get it confirmed.
There was some 20 hours in between my cancellation and the chart preparation
I am sure that the ticket was in the waiting list(W/L 1) at the time of cancellation.
Can someone help me in resolving this.