Sylvie (UC) Entrust Effect Not Working As Intended

[Maurauc]

Platform: Windows
ISP: BT
Type of Internet Connection: Fibre to the Home
Internet Connection Speed: 300Mbps
Date & Time: Wednesday August 5th 2015 22:40PM BST
Frequency: 5/5 (Reproducible 100%)
Character Name: Maurauc
Race: TaruM
World: Valefor
Main Job: RDM 99
Support Job: BLM
Area and Coordinates: Ceizak Battlegrounds
Party or Solo: Solo with 5 Trusts, Solo with 1 Trust
NPC Name: Sylvie (UC)
Monster Name: Multiple (Bight Uragnite, Blanched Mandragora)

Additional information:
Unity Ranking Points for this period: 9

Steps to Reproduce:
(1) Call Sylvie (UC) Trust when belonging to the Sylvie Unity.
(2) Engage an enemy
(3) As RDM, Sylvie casts Indi-Acumen
(4) Sylvie then uses Entrust, before casting Indi-Refresh. The Indi-Acumen buff is immediately overwritten by Indi-Refresh.
(5) Sylvie, noticing that Indi-Acumen has dropped, casts Indi-Acumen again, removing the Indi-Refresh effect.

Intended Result:
Sylvie has an Indi-effect, along with the desired party member that Entrust was used on

Actual Result:
Sylvie's Entrust Indi-Buff overwrites her own, or takes priority, causing her to cast her original Indi-Spell again.