There is a problem that bothering me in the,… last six month maybe?

I have FHD laptop display (1920x1080) with bumblebee + nvidia, and xorg.
First time I installed antergos, it was good, no problem with resolution. It has all resolution I need and I don’t need, complete set of 4:3, 16:9, and anything else.

But after sometime, I forgot how it happened, 4:3 and 1920x1080 was the only available resolution. I can’t change default to 1280x720, or 1365x768, even my game doesn’t detect it.
So after look into some forum I decided to create this script that run everytime I wan’t to launch my game:

cvt 1368 768
xrandr --newmode "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781 798 -hsync +vsync
xrandr --addmode eDP-1 1368x768_60.00

cvt 1440 841
xrandr --newmode "1440x841_60.00"   98.75  1440 1520 1664 1888  841 844 854 873 -hsync +vsync
xrandr --addmode eDP-1 1440x841_60.00

cvt 1440 1024
xrandr --newmode "1440x1024_60.00"  122.25  1440 1528 1680 1920  1024 1027 1037 1063 -hsync +vsync
xrandr --addmode eDP-1 1440x1024_60.00

echo closing in 10 seconds...
sleep 10

Since I can use resolution I wan’t, and no problem when change default resolution to lower I just ignore, but it still weird though. The resolution I add was placed below the list.

now it getting worse. Everytime I changed default resolution to lower. It happened.
I don’t know exactly what happened or how to describe it but here is the pic:
As you can see, there is a gray part and below it is the desktop or viewport or what is it should be called.
The gray part is like there is nothing there. The gray color came from XFCE, (you know when XFCE start up, it show gray color by default).
And below it is the working desktop. YES! It only showed only about 20% of the full desktop.
Look at the mouse and the menu that was pointing “JSON Editor”. That was the mouse who actually pointed at it. It was like the mouse is moving around gray part but it’s working in the desktop below it. And the mouse wont work of we move it to the working part below.

Here is another pic after I changed the resolution:

What could be the problem? Thank you :'D

Additional Info:
~/.xsession-errors ; ~/.xsession-errors.old ; /var/log/Xorg.0.log ; /var/log/Xorg.0.log.old