Hi everybody! My name is Erin and I just purchased a pre-owned Mirro M-0622 Pressure canner. I have used a very similar canner before and the button popped up with pressure and fell when pressure was released. I noticed yesterday that the button on this one does not move at all and the weight doesn’t jiggle unless I touch it with a spoon. The weight basically just hisses while cooking. All my jars sealed after I pulled them out but I’m wondering if something is wrong? Thank you for any help!!