It’s important to distinguish between a regular click and a billable click, which is an event for which the advertiser actually pays. According to ReTarget’s documentation, the system filters out repeated clicks by a single visitor on the same offer within a short period of time, as well as clicks from bots, excessive self-clicks from a single IP address, and traffic from unregistered domains. While researching
ReTarget.gg, I found that invalid events may appear in analytics but do not generate revenue for the publisher. I would check the domain registration and the distribution of clicks by country and device. I would also compare the data over a selected time period. Also, keep in mind that the statistics are based on UTC, so the difference in dates can be confusing. Do you experience this discrepancy all the time or only after certain ad campaigns?