process is still running though forever list is empty

I have a process which includes the node-schedule module to schedule the job per minute, and it uses forever to keep it running. It was fine at first but three same processes were started today according to my logs. I tried to stop the process with 'process stopall', and the forever list is empty. However, it could be observed in task manger that the processes named 'Node.js: Server-side JavaScript' were still running.