About Opens, Clicks, Tracking
Tracking all the stats for every email provider has a lot of variables. Some email services may block content within the email that prevents us from tracking opens.
VPNs are in common use, so are email redirecting services, This means you need to take your statistics as a guideline, not an absolute. Many providers route their websites through Cloudflare effectively hiding their location. Plain text email only clients will not show any link clicks.
So use statistics and Geo Opens with the knowledge that while they are very useful they are not always showing the whole picture. Any tickets to the help desk about this will be referred to this article since we have no control over the vast number of factors affecting this.