Ad impressions that you see in your campaigns may be less than overall downloads you see in your Podbean podcast statistics. The ad impressions will be less than your podcast stats for the following reasons:
1. The advertiser targeted the ads to a certain country, for example the US. In this way, the ads will only be served to US downloads. You may have downloads from other countries, but they won’t be reflected in ad impressions since no ads are inserted when served outside target geographies.
2. The advertiser sets a daily cap for their campaign. When the daily cost reaches their daily cap, their ads will not be served in your podcast.