Shantotto II not targeting enemy weaknesses when Magic Bursting

Platform: Windows 8

ISP: Comcast

Internet Connection: Wireless

Internet Connection Speed: 5Mbits/s

Date and Time: December 1-5 around 12 pm PST and 5 pm PST.

Frequency: Always

Character: Yopanopa

Race: Tarutaru

World: Lakshmi

Main Job: Thief 99

Sub Job: Rune Fencer

Area: Cloister of Storms

Party: Solo with Trusts, using King of Hearts, Apururu, Amchuchu, Selh'teus and Shantotto II.

NPC Name: None

Monster Name: Ramuh Prime

Steps:

1. I was soloing Ramuh Prime Hardmode on Thief/Rune fencer with trusts.

2. Whenever I had made a Light Skillchain Shanotto II would magic burst with Thunder on Ramuh despite it doing minimal damage and would Magic Burst a Darkness skillchain with Water for minimal damage.