Main css file link odd?

I’m sure this is a really stupid question, but does anyone know why my main css link is showing like this in the head - “<link rel='stylesheet' id='roots_css-css' href='http://101share.co.uk/wp-content/themes/kinetic-master/assets/css/main.min.css?8f09aa9246d18ab2810d390dbc3e54b8' type='text/css' media='all' />

Instead of just - "<link rel='stylesheet' id='roots_css-css' href='http://101share.co.uk/wp-content/themes/kinetic-master/assets/css/main.min.css' type='text/css' media='all' /> "

Could it be why it doesn’t seem to think my main css file is being cached?

sorry if this is a stupid question. but I couldn’t find anything on it.

Can you post more of your rendered markup? It’s difficult to grasp what you’re asking in the narrow context you framed the issue.

See here: http://roots.io/using-grunt-for-wordpress-theme-development/