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Don't let it frustrate you, it's really not worth the energy. It's always been that way on FB anyway, it's only on mobile where they can be kept for a short while but they disappear as well.
In the end it's only possible to store up to 5 lives in the game and any extra lives received will be gone the next time you play. When you finish playing you may as well accept them even if you already have a full set as it will send lives back to your friends and will otherwise be wasted since they will disappear the next time you play.