10 games in a row i have Autofill Activated WHY?

It's normal. Autofill is active at all times in draft queue unless you play a game where you are autofilled or play fill or support. Doing either of those things give you autofill protection for two games.

Autofill is deactivated if you was autofilled last game, or you played support, or if you are in your promos.

Because you haven't been autofilled or played support recently.

"Active" just means you can be, not that you will be.