Ultrawide Monitor Overlapping Display with Itself

Hi all,

When trying to extend the display of this MacBook Air, the new display shows a bunch of duplicates all interfering with each other. When first connecting, the monitor says its preferred resolution is 2560x1080 but when I set that in the display settings, the monitor thinks it's 2560x560.

The monitor and cable both work fine with a different laptop; is this a driver issue perhaps?

Any advice would be greatly appreciated.

Thanks!