Hey Guys!

I have a question about the counting charts of Reko (or general counting systems).

I purchased the Casino Verite Software.
So I entered the rules as I wanted it and then I used the charts of the Reko Counting System.
When i take a closer look at the tables, then I see the following recommendations:

11 vs T / 11 vs Ace ---> No Double Down

BUT

10 vs T / 10 vs Ace ---> Double Down if count is 2 or higher


Can someone explain me, how it's possible, that I should Double Down 10 vs Ace if the count is 2 or higher but NOT doing this with 11 vs Ace or 11 vs T ??