I don't know how Sharepoint is tracking the views, but is it possible that there was some content on Sharepoint that loading multiple "pages" inside a single page?
Similar to iframe logic on a normal website, you need to be sure not have Page Views track on both the parent and the children in the frames... or a single load can result in multiple page views (once for the parent, and once for every frame of content).
If you can figure out if there is a tracking call that you can see in the network panel, maybe you can compare various pages for Adobe and SP Tracking side by side.. see if anything seems off.
Maybe there are pages that are missing Adobe completely, but are being captured by SP?
I am not sure how granular the SP tracking is.. can you identify what pages or sections have the most discrepancies?
Basically, the short answer is, as someone who knows your site the best, you will have to try and test... focusing on the areas you identified as being the problems first.. and if you can't identify it, then it might take a lot of persistence and luck to find...
