We report unique download totals as well as adjusted "total" adjusted for shared networks such as universities and large corporations. The unique IP information is a pretty concrete metric, there were that many unique Internet Protocol (IP) addresses that downloaded your media. We can't speak for a competitor, but I suspect they are having issues of some sort. Blubrry statistics are designed the way they are because we use them for reporting to advertisers, we take every precaution necessary to provide the most accurate and audit-able downloadable media statistics in the industry.
Can you share a link to your podcast feed URL? Perhaps Blubrry statistics is capturing URLs that are not hosted at LibSyn, a quick look will tell us real quick.