"Behind Enemy Lines" worded incorrectly/not working as intended

Time: N/A
Frequency: Constant
World name: Phoenix
Character name: Miya Mikazuki
NPC name: N/A
Monster name: N/A
Class/Level: Bard 50
Party or solo: N/A
In-game time: N/A
Area and coordinates: N/A

I have 200 Frontline wins overall across different grand companies (173 with Maelstrom 27 with Immortal Flames) however the achievement lists only the Maelstrom wins and doesn't count any from while I have been with Immortal Flames.

"Guide any of the three Grand Companies to a total of 200 Frontline victories combined." I'm pretty sure that most people reading that description would assume that it means 200 overall wins especially due to the word "combined" instead of 200 wins within a single GC.

Even if this achievement is working as intended - why is it locked to a single GC in the first place? The ADS mount unlike the PvP horses doesn't show any symbolism of a specific GC and can be mounted while in any GC unlike the horses which are locked to their respective GCs. Now if it is just simply worded incorrectly, why hasn't it already been fixed? A simple word change from "combined" to separately would avoid further confusion or even remove the word altogether.

Now I have to wait 13 more days before I can even switch back to Maelstrom to complete this achievement...