Applications Jump to Second Monitor When Attached

When I attach my secondary monitor (via HDMI) to my ASUS Q405U laptop running Arch, any open application window jumps to the secondary monitor, including conky. I have configured the secondary monitor to be positioned above the laptop monitor in display settings, and also set the laptop monitor as "Primary" in display settings.

I have a second laptop that is the same model as above, running EndeavourOS, and external monitor behaviour is similar. I have a third laptop, an old Acer Aspire 1410 running Manjaro (un-updated for 2 years) with different Intel graphics, and again, plugging in the external monitor gives similar behaviour.

I suspect the issue may have something to do with my monitor, Philips Brilliance 272P. This monitor has a built in docking station for power, usb, sound, networking, display...

For more information, please see this forum post