Extreme play time difference between tabs

Hi, so, there’s a very “interesting” difference between the Engagement and Performance tabs play time

There are these insane towers of 10 hour long play sessions and I have no idea if that’s a bug or I should be flattered, they do seem real, BUT they are not reflected on the Engagement Tab I think
Have a look!

Performance tab for last 7 days

Engagement tab for last 7 days

So, my question is… is the performance tab accurate at all and why is there such a big difference in play time average, I tried switching to every other percentile option and they all show about 40 - 41m average. Also I tried to look at a stretch between the two 10h towers and its still like 34m avg on all percentiles.

I guess my other question is, if its not showing on the Engagement tab - should I even consider it real

I think it might be a glitch because in this screenshot:

on the right the “Total” is supposed to be Computer, Phone, and Tablet combined but it is not adding up, so I think it is a glitch.