First time use of Pit Boss Pellets. Using in 6 year old Traeger Grill. Wife started grill as usual. After ten minutes she checked and no heat. I pulled components out to expose the burn box. There was a pile of pellets overflowing the box. When I vacuumed this overflow down to the level of the starter there were big hard chunks of what looked like Lava in the fire box. They could be crumbled with some effort but otherwise they were preventing the pellets from reaching the starter. Normally I use Traeger pellets and I've never seen this in all these years. Almost looks like carbonized sugar. What gives?