The PUTs are all mispriced as they don't give the same payout like a CALL with same params and premium.
Logic would expect that the payout should be equal for such a CALL and PUT, but there is a big gap favoring the CALL. This was already proved in another thread here, and that was the motivation for developing my FairPUT![]()
Your "fair" puts already exist in products like crude oil, FX and interest rate products where prices and interest rates can go negative, or where there's theoretically equal price range in either direction.
If there's theoretically unlimited price risk in either direction (which is not the case for equities) than you'll get your equal payout given a 1 standard deviation move in either direction. Don't trade equities or indexes that have limited downside if you want equal payout in your puts. Trade crude, FX, or Bund options.
I think you need to take some basic statistics courses and learn a little bit how variance, volatility, probability and price distribution work. Here's a good place to start:
https://www.coursera.org/lecture/financial-engineering-1/options-pricing-aZrC4
https://www.optionseducation.org/