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Dunno. I haven’t heard of this bug before. Read this:
Rovio may license to you certain virtual goods to be used within the Service and which you may purchase with “real world” money or which you may earn or redeem via gameplay (“Virtual Items“). Virtual Items are licensed to you on a limited, personal, non-transferable, non-sublicensable, revocable basis and are intended solely for non-commercial use.
Rovio may manage, control, modify or eliminate Virtual Items at any time, with or without notice.
The transfer of Virtual Items is prohibited except where expressly authorized in the Services, as applicable.
Why would Rovio just eliminate your gems for no reason? Did you ever cheat in the game? It might be because of that, but normally you get banned for cheating. If not, file a ticket to Rovio Support and see what they say.