Time: 9:00-9:20 PM CST
Frequency: Every time
World name: Lamia
Character name: Hecate Jutah
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: MNK 60, WAR 60, and SCH 60
Party or solo: 3-man undersized party
In-game time: Didn't check while we were testing, doesn't matter anyway
Area and coordinates: The Binding Coil of Bahamut - Turn 5
Housing: N/A
Steps:
1. Warrior uses Defiance and Convalescence
2. Monk uses Mantra
3. Scholar uses Fey Illumination, Dissipation, and Emergency Tactics and casts Adloquium on Warrior

As a result of the many stacked healing buffs, if Adloquium critical hits, it heals a base amount in the range of 19.5k-20k HP, and applies a shield twice that (39k-40k HP). Emergency Tactics converts the shield into a separate heal on top of the base heal, which should be exactly twice that amount. Instead, the battle log reports heals of negative amounts.

In the three cases we saw, there were reported base heal amounts of 19980, 19838, 19612, and reported Emergency Tactics heal amounts of -25576, -25860, -26312 respectively. If these are treated as overflowed signed integers and converted to the unsigned equivalent, they are 39960, 39676, 39224, exactly twice the base heal amounts, which is what would be expected.