Weird wallpaper placement on dual monitor setup on "transform, 3" secondary monitor mode

[srdjanpavlovic]

My dual monitor configuration is like this

1. Primary monitor is 2560x1080
2. Secondary monitor is to the LEFT of primary monitor and is potrait oriented.

After some experimenting, I found this to be right configuration:
monitor = DP-2, 2560x1080@75, 0x0, 1
monitor = HDMI-A-1, 1920x1080@60, -1080x-540, 1
monitor = HDMI-A-1, transform, 3

With this, Wallpaper looks fine on DP-2 (main central monitor), but on secondary monitor looks weird even if I select image of exact dimensions of 1080x1920 (portrait image).

Samples of screen shots


are attached.