What are 'Unusable Currency'?

SkyeLeonne

I'm referring to the latest Game Update post
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/92831/2-27-2017-game-update#latest
"Added Galactic War Currency (War Tokens) to players' accounts to unstuck unusable currency"

Gezesh_Rahl

Long time ago you could refresh GW shop with 10 GW currency, later they changed it to crystals, and some players had 170, 20, 40, etc GW currency left they couldn't use