The Listening Methods and Referrals section may not tally up to the exact same totals as the overall number of downloads in any given period.
Ultimately this is because there are too many potential listening methods and referrals and downloads for us to chart them all at once.
Instead, you'll see the top most popular listening methods and referrals. This will cover the bulk of the numbers, but at the same time, it's expected that there will be a few downloads represented by outliers/very low numbers that aren't included in the graph.