is it a bug

Hi boboxsi

No, it is not a bug.

This plugin uses implied consent method, which means that a visitor doesn’t need to click the accept button explicitly. It assumes that visitors have given their consent by visiting and browsing your site. That’s why the notification won’t appear if the visitor browses or revisit your site.

This method is quite common practice and is being used on most of sites.

Hope it explains your query.

Thanks