Loaded the stove and kept the door open for 2-4 min. Shut the door and after 10 - 15 seconds the stove burst. Blew the top stones up about an inch. I tooke the wood and tossed it out the window. I have pushed the stones back in place, but there is gaps and they are not sealed. Thoughts? I cant se why this would happen, I understand gasses can build up, but this is not something I would expect to blow the top off of the stove.