Umbral and Astral buffs on Kaliya bug

Time: Multiples days and times in the past 3 weeks
Frequency: Sometimes
World name: Sargatanas
Character name: H'lcyon Maro
NPC name: none
Monster name: Kaliya
Class/Level: Black Mage 50
Party or solo: Full Party
In-game time: unknown
Area and coordinates: Turn 11
Steps:
Summary: When casting Fire 3, Blizzard 3, Fire 1, and Blizzard 1 on Kaliya each has failed to register in some way. It may only be in the final phase. Sometimes it only fails once, sometimes it fails multiples times in a row. I have noticed the spells use mana and not register the respective Umbral or Astral buffs, and I have also noticed the buff fall off while the spells fail to consume mana, as if they did not trigger at all.
I am accuracy capped. The spells did not miss.

Connection Specs
- Type of internet connection/provider: Time Warner Cable
- Modem maker/model number: Motorola

PC Specs
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Are you sure you aren't trying to hit it while it's invulnerable? Any attacks that are completely mitaigated don't activate their aditional effects.