Filter results different for same date range in Manage and Reports

My colleague and I always add each other to a signature group, but the number of documents in our accounts is different (sometimes I can see documents he initiates, sometimes not, and vice versa). We need to archive all documents from both accounts for compliance. To compare our accounts, we are trying to export a list of all documents from each of our Adobe Sign accounts for a given date range. Manage Documents shows me 368 documents for that date range, but Reports for the same date range shows only 133. My colleague gets similar behaviour in his account. Any idea why?