Anyone else noticed that the full screen bug is back? When you use the f key on a MacBook pro running 10.13.6 and Photoshop CC 19.1.6 as you go full screen it changes the colour profile. I think this was an old bug that seems to have returned.
Which monitor is your primary monitor (in the Mac OS Preferences)? Try switching them, restart Photoshop and see if it still happens. I believe your seeing your primary monitors color profile applied to the secondary monitor.