Stats Discrepancies - what to do?

Our Adservers are all 3rd party hosted, and we relay on 3rd party reports for count of delivers made across the network. Both Publishers & advertisers are bound to stick to those numbers.

In industry usually 8-12% discrepancy is standard, which can come across two adservers which you deliver traffic, this can be due to various factors, which can be due to server uptime, time zones, counting uniques, traffic blocking, firewalls, or compatibility as well, so as soon as you notice such problem going above 12%, inform your account manager ASAP.