Run npm run webpackDevServer; Two processes are opened, and only one process can be closed when Ctrl+C is closed.

  node.js, question

Run npm run webpackDevServer; Two processes were started.
When Ctrl+C is closed, only one process can be closed.
There is still one reservation, how to solve this problem?
Is it npm problem or is there something wrong with me?

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Please help win8.1′ s system change today. is it a system problem?

Additional questions: I tested several times and found that only webpack-dev-server has this problem. I didn’t find this problem when using gulp

Is Task Manager TerminateProcess Useless