The ceramic fiber board that sits above the secondary burner tubes.... Now according to the manual, they say you can take it out and brush/vacuum it off for normal seasonal cleaning. Well during this recent warm spell where i didn't need the stove, i peaked my head in and saw that it's SUBSTANTIALLY smaller than before my first burn (Nov 2017). Like "almost too small for the holding bracket" smaller Is that normal?? Is it only good for 1 season?? Am i doing something wrong??