to help i put a debug here where that problem ocurre (sorry for the long text):
[19:16:29:764] Cleared POI - Reason NeedToClearPOI is true #2
[19:16:29:764] Cleared POI
[19:16:30:377] Changed POI to:Type: Kill, Name: Bloodeye Magelord
[19:16:30:952] Activity: Loading Tile/s
[19:16:31:378] Spell_C::CastSpell(17, 0, 0x500000003B2251B, 0) [327]
[19:16:33:081] Spell_C::CastSpell(73510, 0, 0xF530B2E3003F4C05, 0) [328]
[19:16:35:367] Spell_C::CastSpell(73510, 0, 0xF530B2E3003F4C05, 0) [329]
[19:16:37:000] Spell_C::CastSpell(73510, 0, 0xF530B2E3003F4C05, 0) [330]
[19:16:38:969] Spell_C::CastSpell(8092, 0, 0xF530B2E3003F4C05, 0) [331]
[19:16:41:924] Cleared POI - Reason POI is dead from Combat
[19:16:41:924] Cleared POI
[19:16:42:150] Changed POI to:Type: Loot, Name: Bloodeye Magelord
[19:16:43:403] InteractDebug:1410946192
[19:16:43:417] Interact Done:1410946192
[19:16:44:465] Cleared POI - Reason Waiting for loot flag
[19:16:44:466] Cleared POI
[19:16:45:253] Activity: Moving to hotspot
[19:16:47:317] Changed POI to:Type: Kill, Name: Twilight Ettin
[19:16:48:810] Spell_C::CastSpell(17, 0, 0x500000003B2251B, 0) [332]
[19:16:50:630] Spell_C::CastSpell(73510, 0, 0xF530B30E003F4917, 0) [333]
[19:16:52:877] Spell_C::CastSpell(73510, 0, 0xF530B30E003F4917, 0) [334]
[19:16:54:639] Spell_C::CastSpell(73510, 0, 0xF530B30E003F4917, 0) [335]
[19:16:56:424] Spell_C::CastSpell(8092, 0, 0xF530B30E003F4917, 0) [336]
[19:16:57:898] Spell_C::CastSpell(32379, 0, 0xF530B30E003F4917, 0) [337]
[19:17:00:849] Cleared POI - Reason POI is dead from Combat
[19:17:00:849] Cleared POI
[19:17:01:133] Changed POI to:Type: Loot, Name: Twilight Ettin
[19:17:01:388] InteractDebug:1410795392
[19:17:01:422] Interact Done:1410795392
[19:17:02:731] Cleared POI - Reason Waiting for loot flag
[19:17:02:731] Cleared POI
[19:17:03:682] Changed POI to:Type: Loot, Name: Twilight Ettin
[19:17:04:178] InteractDebug:1410795392
[19:17:04:223] Interact Done:1410795392
[19:17:07:405] Cleared POI - Reason Waiting for loot flag
[19:17:07:405] Cleared POI
[19:17:09:316] Changed POI to:Type: Kill, Name: Twilight Ettin
----------------> it's here where he detect the Ettin but not kill, and select another mob,... so he get goes forward and agro more than 1[19:17:10:363] Changed POI to:Type: Kill, Name: Bloodeye Brute
[19:17:10:616] Activity: Moving towards Bloodeye Brute
[19:17:11:637] Changed POI to:Type: Kill, Name: Bloodeye Brute
[19:17:12:391] Spell_C::CastSpell(17, 0, 0x500000003B2251B, 0) [338]
[19:17:13:880] Spell_C::CastSpell(73510, 0, 0xF530B2DB003ED9E7, 0) [339]
[19:17:15:454] Spell_C::CastSpell(73510, 0, 0xF530B2DB003ED9E7, 0) [340]
[19:17:17:058] Spell_C::CastSpell(8092, 0, 0xF530B2DB003ED9E7, 0) [341]
[19:17:18:224] Spell_C::CastSpell(32379, 0, 0xF530B2DB003ED9E7, 0) [342]
[19:17:20:362] Cleared POI - Reason POI is dead from Combat
[19:17:20:362] Cleared POI
[19:17:22:451] Spell_C::CastSpell(73510, 0, 0xF530B30E003F4EC9, 0) [343]
[19:17:23:768] Spell_C::CastSpell(2944, 0, 0xF530B30E003F4EC9, 0) [344]
[19:17:25:037] Spell_C::CastSpell(73510, 0, 0xF530B30E003F4EC9, 0) [345]
[19:17:26:795] Spell_C::CastSpell(73510, 0, 0xF530B30E003F4EC9, 0) [346]
[19:17:28:082] Spell_C::CastSpell(73510, 0, 0xF530B30E003F4EC9, 0) [347]
[19:17:30:130] Spell_C::CastSpell(8092, 0, 0xF530B30E003F4EC9, 0) [348]
[19:17:32:957] Changed POI to:Type: Loot, Name: Bloodeye Brute
[19:17:33:920] Changed POI to:Type: Kill, Name: Bloodeye Brute
[19:17:34:344] Spell_C::CastSpell(17, 0, 0x500000003B2251B, 0) [349]
[19:17:36:417] Spell_C::CastSpell(73510, 0, 0xF530B2DB003E65A4, 0) [350]
[19:17:38:558] Spell_C::CastSpell(73510, 0, 0xF530B2DB003E65A4, 0) [351]
[19:17:39:926] Spell_C::CastSpell(73510, 0, 0xF530B2DB003E65A4, 0) [352]
[19:17:42:169] Spell_C::CastSpell(8092, 0, 0xF530B2DB003E65A4, 0) [353]
[19:17:44:892] Cleared POI - Reason POI is dead from Combat
[19:17:44:892] Cleared POI
[19:17:45:129] Changed POI to:Type: Loot, Name: Bloodeye Brute
[19:17:46:008] Changed POI to:Type: Kill, Name: Bloodeye Brute
[19:17:46:805] Spell_C::CastSpell(73510, 0, 0xF530B2DB003EDD4F, 0) [354]
[19:17:48:984] Spell_C::CastSpell(73510, 0, 0xF530B2DB003EDD4F, 0) [355]
[19:17:50:901] Spell_C::CastSpell(48045, 0, 0x0, 0) [356]
[19:17:50:935] System.NullReferenceException: Object reference not set to an instance of an object.
at Hera.Spell.Cast(String spellName, WoWUnit targetUnit) in......\CustomClasses\.....\Flib\Flib.cs:line 2535
at Hera.Fpsware.,,.Run(Object context) in ......CustomClasses\.....\Class Specific\Behaviours\Combat.cs:line 687
at TreeSharp.Action.RunAction(Object context)
at TreeSharp.Action.#h.#nF.MoveNext()
at (Object )
at TreeSharp.Composite.Tick(Object context)
at TreeSharp.Decorator.#h.#nF.MoveNext()
at (Object )
at TreeSharp.Composite.Tick(Object context)
at TreeSharp.PrioritySelector.#h.#nF.MoveNext()
at (Object )
at TreeSharp.Composite.Tick(Object context)
at TreeSharp.PrioritySelector.#h.#nF.MoveNext()
at (Object )
at TreeSharp.Composite.Tick(Object context)
at TreeSharp.Decorator.#h.#nF.MoveNext()
at (Object )
at TreeSharp.Composite.Tick(Object context)
at TreeSharp.PrioritySelector.#h.#nF.MoveNext()
at (Object )
at TreeSharp.Composite.Tick(Object context)
at TreeSharp.PrioritySelector.#h.#nF.MoveNext()
at (Object )
at TreeSharp.Composite.Tick(Object context)
at TreeSharp.PrioritySelector.#h.#nF.MoveNext()
at (Object )