Calendar don't work like normal straddle or vega negative. Calendar means shorting high iv and long low iv set-up if trading atm or little offset classic calendar.
https://twitter.com/_rajade/status/1470329615554007040
There is some difference always wat we look in theory and practical. Hope this link will be helpful.
https://twitter.com/sanjufunda/status/1462780309519450113?s=20
Even today example, once fall create difference, then again fall make almost 5 pts iv difference as well delta mgmt avg. Eod gained quick 1% on margin within 2 hrs. 
Also few experience observation. Weekly iv spike normally giveup early than monthly. Payoff tool in India generally don't hv such detailed option to plot different iv for calendar, they believe if iv gain then gain for both expiry same.
Even delta bother little bit; both option ITM still gain good.
Bhaiya kya chal raha; Aaj kal toh Risk Free chal raha.
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