Hello Girls and Boys!

How is that possible when playing Double Deck H17 DAS (with a strategy of REKO-F) on Casino Verite the Index numbers given in the game differ from the book of Modern Blackjack listed?
For example in Casino Verite it says i need to insure at +7 on the other hand Modern Blackjack It shows +2. (DOUBLE DECK)
And other index numbers differ too. They do not match at all.

I am confused.

Thanks for any reply