[lscotte]

I think this is intentional, as the norm is for 0 on a Y-axis to be at the bottom and increase going up.

I can understand why it's confusing, and perhaps could be a UI option to reverse it, but I do think that's the reason.

[brendangregg]

Yes, that's the reason! It means we get a t=0 origin for both the x- and y-axis. But yes, we can also add UI options to reverse it and other things.

[wkz]

Yes, I agree with it being that way. I just think my brain parses the origin as being the corner that is closest to the "0" label. Therefore, if the labels where below the plot, there would be no parse error :)