Levels Adjustment layer now updating for new under-layer.

[ivan25349743g7a0]

Levels adjustment layer "Bugged" been created for another layer "Old" that is now deleted.
Levels adjustment layer "New" created afterwards for the layer "Background".

Question 1:
Why level adjustment Levels adjustment layers with same exact settings give different results?

Question 2:
What settings do i use to get same results as from Levels adjustment layer "New" as currently shows in Levels adjustment layer "Bugged"?

BuggedNew

[D Fosse]

Note that the difference has nothing to do with your actual adjustment! You've dragged the white endpoint, but the difference is in the black point.

There's no way to explain this other than as a GPU bug, or possibly that the background layers aren't exactly the same.

[c.pfaffenbichler]

Did you check the individual Channels? 

Edit: These screenshots might be clearer: 

[D Fosse]

Ah, brilliant. Of course. 🙂