Confusing average playtime data

Lately i have noticed that average session time from the performance page and average session time from the engagement page don’t align. I was just curious whether this is a bug or is it just that i don’t understand how both statistics are calculated.

As shown on the picture after a recent update the average session time in the engagement page has went up slightly.

Meanwhile the same statistic in the perfomance page has massively dropped.

At this point im just confused and I don’t know how to interpret these stats. I would be very grateful if someone could explain what’s happening here. (Also if it matters my game contains just 1 place)

Session time in performance vs engagement is not calculated with the same method

https://devforum.roblox.com/t/analytics-engagement-average-session-time/2667529/2?u=planetville