We had war sunny weather here yesterday, so I let my stove burn out so I could do a mid-season chimney sweep. I have a Jotul F 600 stove with a 16' ss flex liner running inside a clay tiled masonry chimney that is located in the center of the house. When I removed the lid on the stove to gain access to the top of the baffle and flue collar I was surprised to see about a quarter inch of light gray ash covering the entire insulating blanket that rests on top of the baffle. I got the stove last February and burned through the cold spring before doing my first chimney cleaning in late summer to get ready for the burning season. With that first sweep there was a small amount of ash above the baffle, but only around the edges. Does anyone know what could cause that much ash to end up on the top of the baffle. I have the stove set up with a rear exit on my flue collar into the T-connector and then up the chimney.