Seasoned new Gen 1 MES 40 according to instructions. Instead of adding chips to the tube I used my new AMNPS. Once seasoning was complete I lowered the temp to desired cooking temp and added food. Everything was going great for the first hour or so of cooking. After nearly 4 hours since lighting the AMNPS I decided to check on the smoker and noticed my first row of pellet waS nearly completely burned. Shortly afterwards my high temp alarm went off on my bluetooth thermometer. The smoker was 350 degrees and the AMNPS was completely engulfed in flames. I'm trying to figure out what I could have possibly done wrong for this to happen. I assumed from all the posts here most people that had issues with the AMNPS had problems with it not burning or producing smoke. I had the complete opposite problem. The AMNPS was placed in the smoker with the burning end to the left and was located below the dry water pan to the left on the 2 horizontal bars. The chip tray and tube were both pulled out about an inch. Really hoping to prevent that from happening ever again. Any help or advice would be greatly appreciated. What did I do wrong?