Bug in stacking order of windows

[Aravisian]

That would be Intel Iris Xe Graphics...

Intels supplied drivers for the Iris Xe has been a thorn in many users sides.
You might try setting the grub parameter nomodeset:

[HOW TO] add a grub parameter

There may be times that a user must add a specialized grub parameter in order to overcome an issue. The purpose of this guide is not to provide parameters, as that would be a case by case basis. It is to provide a guide on how to add one. To add a parameter, in a terminal (TTY, Recovery Prompt or Terminal Emulator) run: sudo nano /etc/default/grub Arrow key down to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and place your parameter within the quotation tags. For example if you are adding th…

And removing the Intel Drivers:

sudo apt remove xserver-xorg-video-intel