Every time I use npm run build there is some code added to index.html

<body class="launching"><script type="text/javascript" src="main.js?859fb9964720e04fbbcd"></script></body>

if I run again


<body class="launching"><script type="text/javascript" src="main.js?859fb9964720e04fbbcd"></script><script type="text/javascript" src="main.js?c1aeb986d874b81c6248"></script></body>

Don't know why is this happening

any ideas?

Happens with new generated project and existing ones.