Why is Firefox Focus not blocking trackers or ads consistently on some websites?

I have been using Firefox Focus for private browsing and overall it works well, but I’ve noticed that on some websites it doesn’t seem to block all trackers or ads properly. In a few cases, pages also reload or behave differently compared to other privacy-focused browsers. I want to understand if this is normal behavior, a settings issue, or if there is something I can do to improve tracking protection. Any guidance on how Firefox Focus handles blocking on different sites would be really helpful.