I made several Pate de fruit with G-pectin from Andrew Shotts book - Making Artisan Chocolates. (Strawberry, Raspberry and Pineapple) Pate de fruits worked find. Layered with chocolate ganache, footed, cut, air dried. I dipped in chocolate. A few days later, I notice there was a grittiness to the truffle. Seemed to be occurring between the top of the pate de fruit layer and the dipped chocolate. Any ideas as to why this might happen?