Flipkart — Amount showing before payment and after payment is different and offering no cost emi in words but not effective during payment

Order ID - OD[protected]

I have purchased a product from flipkart today, order id above.
The total amount and item level breakup just before making the payment and after making the payment is different. Difference of Rs.1783.

Also, no cost emi is offered on some credit cards.
I choose no cost emi for 9 months and the interest amount calculated by flipkart (Rs.1783) is added to the product amount and discounted the same interest amount (Rs.1783) in the item level breakup. I don't understand what is the logic behind that.
And, the interest amount calculated is not present in the item level breakup of the order details, only the discount item is mentioned.

I paid, Rs.28058 for the order however Rs.26275 is showing in the order details.

Screenshots attached for your reference.