Thanks for this. I've just tested it. However....
I found that the picture is squashed top and bottom, as if the horizontal axis is correct but because the monitor is ultra-wide the picture tries to squash everything into the available space, hence squashing the image vertically.
Interestingly enough when I took a screenshot of the game and pasted the result it looks perfect. So maybe the engine is trying to project the correct image into a more 'letterbox' shape.
Examples;
In-game it looks like this;
But when I take a screenshot and paste the result it looks fine: