Squadron Battle Tactics not improving

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Date & Time: May 26, 11:20am server time
Frequency: witnessed once
World name: Omega
Character name: Mi An
Retainer name: n/a
NPC name: E'ptolmi
Monster name: n/a
Class/Level: 53
Party or solo: solo
In-game time: about May 26, 11:20am server time

Area and coordinates:
Sohm Al command mission duty
Housing: n/a
Steps:

I done Sohm Al with my squadron (me as tank) and at the end of the duty, when I returned to the barracks, the officer says me that E'ptolmi reached level 4 of the balanced battle tactics, but after I accepted the result, when I go to E'ptolmi to see her battle tactics, I see she still have level 3 on balanced. I expected to see level 4.