Hmm, no clue tbh.
the logs clearly states;
[12:06:00.528 D] Changed POI to: Type: Loot, Name: Spirit-Bound Sentry
[12:06:00.619 N] [PotionUser] Using Potion of Luck on Lvl 90 Horde Hunter
[12:06:00.651 N] Moving to Type: Loot, Name: Spirit-Bound Sentry
[12:06:00.732 N] [PotionUser] Using Potion of Luck on Lvl 90 Horde Hunter
[12:06:00.764 N] Moving to Type: Loot, Name: Spirit-Bound Sentry
[12:06:00.849 N] [PotionUser] Using Potion of Luck on Lvl 90 Horde Hunter
[12:06:00.884 N] Moving to Type: Loot, Name: Spirit-Bound Sentry
[12:06:00.961 N] [PotionUser] Using Potion of Luck on Lvl 90 Horde Hunter
[12:06:00.992 N] Moving to Type: Loot, Name: Spirit-Bound Sentry
[12:06:01.063 N] [PotionUser] Using Potion of Luck on Lvl 90 Horde Hunter
[12:06:01.095 N] Moving to Type: Loot, Name: Spirit-Bound Sentry
[12:06:01.178 N] [PotionUser] Using Potion of Luck on Lvl 90 Horde Hunter
- so it should work, and you're high enough lvl to use it..
i'd try and post the issue on the plugin's original thread and see if that gets you anywhere,
sorry i couldn't help
Good luck!