Yeah, that can't be right. Not even close. Make sure your probe in stuck in from the side of the flat, not from the top. And the tip is fully buried evenly in the flat. Maybe your probe is not accurate (got waterlogged at the connection during washing, etc.) Do you have another probe? I would yank that probe out and let the brisket keep going, and do a test on it. Plunge into ice water, temp should register around 32 degrees. Boil some water in a pot, and put it in the pot not touching the bottom or sides. Temp should read around 212. Beyond that, I'm stumped. I hope someone else is watching...