Can't Interact with Second External Monitor I have connected two external monitors to my MacBook Pro through USB-C to an Anker docking station.  The displays appear to be arranged correctly in the settings (screenshot below)
In the image, Monitor 1 is my Macbook Pro.  Monitors 2 and 3 are external through the docking station.
The problem is, for some reason monitors 2 and 3 are 'mirrored' in the sense that their displays are identical.  However, I can drag my mouse from 2 to 3 as though they were extended.  I cannot actually interact with monitor 3 using the mouse however.
Any pointers to fix this bizarre behavior would be appreciated!  Thanks for looking
You could try using the program I wrote, displayplacer, which was developed to deal with the wonkiness of macOS screen layouts. For your particular situation, you'll want to run displayplcer list to output your current monitor setup. Then, edit that profile so that it isn't mirroring. Mirrored monitors are after the + sign in the id section. It'll take a bit of fiddling. Once you get it working though, you can assign that displayplacer command to a hotkey. Then, whenever this happens again (usually every time you plug in), type the hotkey to set your monitors to the correct layout.