'None' is simply the count of the given dimension value against the metric(s) you have pulled into the given report view. If you feel this is in error per your implementation coding design then I would explore the 'none' portion of the report and break it down by site content variable to pull apart where it is occurring on your site. In your example for instance there may be either some way to bypass UserID, UserID is not set in all cases (for those visits where a login does not occur), or you are pulling in a metric that is counting the pre-login state as a 'None' phase and the post-login state as under the proper UserID.
https://marketing.adobe.com/resources/help/kb/en_US/analytics/kb/none-unspecified-and-unknown.html
Best,
Brian