PFI-Y direction is different from Sky-Y direction when position angle = 0?

Checking the output of the latest version with default values, I found that configuration pattern is different between PFI coordinate and sky coordinate by (probably) 90 deg. (see attached plot).
I think the direction of Y-axis of PFI coordinate should be matched to the Y-axis of sky coordinate (declination) when position angle = 0. I think I did not get this difference in the previous version. I might be stupid (as usual), but could you check the conversion code please?