OK, this sounds like a mutter bug... unless that weirdness in your Xrandr.txt is related:
eDP-1 connected (normal left inverted right x axis y axis)
...
DP-1 connected primary 2560x1440+0+0 (0x152) normal (normal left inverted right x axis y axis) 600mm x 340mm
This means the desktop is arranged primarily to fit your external monitor (DP-1) but the built-in screen (eDP-1) has no known position. So it may not update properly. This is too suspicious to ignore so would be the first thing for someone to look at.
OK, this sounds like a mutter bug... unless that weirdness in your Xrandr.txt is related:
eDP-1 connected (normal left inverted right x axis y axis)
...
DP-1 connected primary 2560x1440+0+0 (0x152) normal (normal left inverted right x axis y axis) 600mm x 340mm
This means the desktop is arranged primarily to fit your external monitor (DP-1) but the built-in screen (eDP-1) has no known position. So it may not update properly. This is too suspicious to ignore so would be the first thing for someone to look at.