One of the main factor about this issue is conveyor machine.
Conveyor bucket (bowl) shaped square , it made the candies got hold in the corner of the converyor.
Example: when bowl already fill with 5 pcs candies, which fall into sachet only 4 pcs, another 1 pcs was left in corner of conveyor. It makes the sachet's content less than it should be.
QC informed that they will replace existing bucket (long term correction plan).
While waiting for new bucket, QC will modify front side of existing bucket so the height will reduce and make the candies easily fall into sachet.