I just started using Opal last week and I really enjoy it!
However, I’ve noticed for me as I usually browse websites in safari and have offloaded all apps from my phone, Opal will count the screen time twice.
For example, if I spend 15 minutes on Safari, and 10 minutes of that is Reddit, Opal will total my screen time for that hour as being 25 minutes instead of 15.
I have noticed the same thing as well! On the total hours listed the next day (when comparing to peers in the Community heading), I don’t think it’s double counted, but it does appear to be in the current day’s total.