Inconsistent Tracking Across Multiple Menu Pricing Sites – Possible CDN or Tag Issue?

Hi everyone,

I’m currently analyzing web traffic across several menu and pricing-related websites using Matomo (self-hosted), and I’ve noticed some inconsistencies in the data — particularly with pageviews, visit durations, and bounce rates. The sites use a mix of platforms and tracking configurations, but all have the Matomo tracking code correctly implemented.

Some of the pages I’ve been reviewing:

  • starbucks. com
  • dunkindonuts. com
  • dbmenuss. com
  • peets. com

I’m not the owner of these sites — they’re part of a research project to understand user flow and engagement patterns in pricing-based content.

The issues:

  • Some visits don’t appear at all in the Matomo reports.
  • Bounce rates on some high-content pages are unusually high.
  • Session durations sometimes register as 0s even when multiple events are triggered.

What I’ve checked:

  • Tracker is loading (confirmed with the Matomo debug console)
  • No JavaScript errors on pages
  • No ad blockers during testing
  • Tag configuration is consistent across domains (where applicable)

Is it possible that CDNs, aggressive caching, or third-party cookie limitations are interfering with tracking?
Would love to hear from others who track multiple unrelated domains — how do you ensure consistency and accuracy?

Thanks in advance for any insights!