It definitely sounds like a a graphics card problem. My advice would be to go to your computer manufacturer's website and download the video driver that goes with your system. Or if you know the manufacturer of the graphics card, go to their website and download the driver for that specific card.
If that doesn't work, you could try setting your screen to the second highest setting, and see if it works.
I've tried looking on the site and cant find any software downloads. I'm not sure if I'm missing it somewhere. I checked the LG site and looked up my IPS235 screen, but no software was offered besides Adobe and some other file type. no driver updates.
I've tried many settings. The one I have now is fine but when i compare it to my android it still seems a tad stretched.
It may even be that your graphics card can't handle the monitor. An option you could try is to get another graphics card, preferably a newer one, to try out, and see if it can handle the monitor. If it can, then you know the problem is that the graphics card needs updating.