Hi.
Several times in past projects it happened to me to trip a bug when clicking in the procedures drawer (I had to close the navigator and restart again MIT App Inventor to be able to continue working on the project)
But today I started a new project, and when clicked on the projects drawer, I discovered that some of the procedures of another projects were already there.
In fact, I previously grabbed from the back pack just one of them.
Does this give you a hint of what might be happening?