Just found out there are some surface rust on top of the surface of the baffle tubes. The wood I c/s/s are 2 yrs old ash and 4 yrs old oak and maple covered. Any of you have same thing happening to your stove as well? It's puzzling as the stove warms up the room and bring down the room humidity, heat is dissipating from the stove. I don't usually hear any sizzling noise from moisture on logs.