I have observed consistent discrepancies in the projected payoff graphs for spreads in Sensibull. These discrepancies are particularly concerning as the same strategies show accurate payoff projections on Opstra.
@apple.avadhesh @siva
Sensibull is showing the correct payoff chart. The discrepancy is because, from January, the lot size is changing from 25 to 75, which is taken into account in Sensibull but not in Opstra. You can confirm this by increasing the lots from 1 to 3 for December expiries on the Sensibull platform.
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Thanks for the clarification! I tried increasing the lots from 1 to 3 for December expiries on Sensibull, and it matches perfectly. 
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Could you please help me how to calculate expiry pay off if call buy option having 2 legs 1 is expire on 26th december and 2nd leg expiry is 2nd Jan.
How-to calculate payoff near upcoming expiry i.e 26th december.
What are the strike prices for both legs, and which one is the buy position and which one is the sell position?
yes this is related to long calendar option strategy.