WowAce

So I just installed rarity and created a custom tracker for an item. Everything works well except it doesn't automatically update my attempts. When I kill the mob I'm tracking the attempts don't update, I have to go and manually do that myself everytime I kill the mob. 

The item I am tracking is Delusions of Grandeur (http://www.wowhead.com/item=144279/delusions-of-grandeur)

which is dropped by Gorgroth (http://www.wowhead.com/npc=110832/gorgroth).

When I kill him it doesn't track it as an attempt, I have to manually put my number of attempts in every time i kill him. Here are some screenshots of my custom settings:

https://imgur.com/a/S8CPE

Without commenting on what you are trying to do here, the kill statistics ID overrides NPC ID (as it is provided by the WOW API and generally more reliable). The ID you entered is invalid; there likely isn't any specific statistic tied to a random mob somewhere in the world. They're for raid bosses or other "notable" encounters.

The drop rate you entered is also 1 in 6975, and not the 0.1% wowhead suggests. Not that it matters much, but farming a specific rare for a randomly-awarded legendary item is not exactly what Rarity was designed to do :)