Zerodha Coin SIP on holidays

Why are my SIP’s debited from my bank account on holidays?

Assuming 21st is a Saturday, the order is processed on 23rd. Then why is the money debited on 21st itself?

AMC SIP’s are debited on 23rd only. The other SIP’s are debited on 21st.

Curious to know…if it’s not a holiday, are you getting same-day NAV? and is this SIP via NACH or UPI?

The order is processed on the next working day only. The NAV is applicable of the next working day only.

But the amount is debited on the holiday