It happens when you selected harmony shards on honing gear but not pressing the gear honing button, then you switch to another gear, your harmony shard will go down to 0 no matter how many you have, please fix this problem and return the missing harmony shards to us!
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please letme know if you find a solution, i have lost 14k now in two days to this bug.
I just had the same problem, I hope they fix this