[FIXED] [Mage][Legendary] shattered fragments of sindragosa requires 16 casts

[Redpill]

WoW Freakz item link: https://www.wow-freakz.com/item_finder.php?item=151810&&name=shattered-fragments-of-sindragosa
Bug description: The build-up buff stacks to 15, then you receive the buff calling comet storm on next frostbolt or flurry cast, making it effectively require 16 casts.
It should stack to 14 not 15.
build-up buff: https://www.wow-freakz.com/spells.php?spell=248100&&name=shattered-fragments-of-sindragosa
or maybe this: https://www.wow-freakz.com/spells.php?spell=248176&&name=shattered-fragments-of-sindragosa
this is the buff that calls down comet storm on next FB or flurry cast: https://www.wow-freakz.com/spells.php?spell=248177&&name=rage-of-the-frost-wyrm
Proof: I read the item description
+
https://www.wowhead.com/item=151810/shattered-fragments-of-sindragosa#comments first comment
+
check out his buffs
https://youtube.com/watch?v=KQLpnXoOZSU&t=90:

[NurZooL]

Tested.
Confirmed.

[Quicksand]

Fixed