Quote: "What else do i need to add so my application make a clean shutdown and close at the end (and not show up in the active program list) ?"
My tablet does the same thing (not just AppGameKit apps but all of them), so I am not sure if it is certain versions of Android or what.
I think it is just an effort on Android's part to keep things going for faster reloads or something.
I just pull up that menu after I exit the game (hitting that middle menu button), then close it from that list (x).
Another step, but not a big deal really.

Coding things my way since 1981 -- Currently using AppGameKit V2 Tier 1