Bests & Worsts Reviews from Amazon

I don't know what happened with this but the first time I used it, it was in the oven for maybe 15 min at 350 when my whole kitchen filled with smoke. It had melted in the oven leaving a white powder covering the entire inside of the oven and a pile of what looks like ash where it melted. I've had Sillats before and never had anything like this so I'm not sure if this is a knock off or what but my oven is a disaster and then smoke/ash got into the fan unit and I'm not sure what to do. Argh!!