Mate experienced the same with 2217 a couple of years ago and sent message to ADI. They replied that it was OK with a blah blah lah explanation IIRC about controlled levels of moisture during the process. About the same time I saw mention of clumping powder on an Oz forum.
Can ask mate when I next see him if you want more specific details.
If you bought it new from a shop I would still hit them up for an explanation.
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