Ports remain open sometimes

Even after calling nctl-stop / nctl-clean, some of the ports sometimes remain open. When trying to then call nctl-start, it leads to some of the nodes exiting because supervisor can't assign them ports. Nothing is shown in the terminal. I discovered it by looking into the logs (casper-node/utils/nctl/assets/net-1/nodes/node-1/logs/stderr.log) and discovering a message that supervisor failed to create a listener on 0.0.0.0:22101. The only process using those ports on my machine is NCTL.