Hi bombardino3, Believe it's because a unique visitor can return to site
multiple times and therefore will appear in mulitple days since last
visit buckets e.g. Visitor comes to site Mon, Wed, Thurs. Their visit on
Weds (last visit Mon) means the visitor is in the 2 day bucket, their
visit on Thurs (last visit Weds) means they are also in the 1 day
bucket. If you switch your metric to visits it will total 100%. Thanks