So Its close to 0 deg. outside and I put my cold weather pellets in the stove Cubex $7.00 a bag. As they are running they are making a clumpy ash in the burn pot. It kind of looks like what comes out of the back end of a small dog. greyish brown and about 1/2 inch round. The fire is hot, as hot as the Okies and Vermonts. Anyone having this problem with this years Cubex?