I attached an image of my project, as you can see nodes such as threshold an multiply are grey and do not display an image. I found that deleting those nodes and then reconnecting them makes them work for a bit but then they go back to not displaying anything and not doing anything to the project.
What happens if you lower the Threshold parameter?
Looks like like in your feedback loops the values change over time, such that the threshold is simply 0 everywhere. What exactly is happening isn’t obvious based on your screenshot. But the nosed are working. They are doing what you’ve told them to do.