The image when I set the game resolution to 1080p (my native resolution):

The image when I scale the resolution down to 720p (it fits properly):

Basically, the issue seems to be that FS15 thinks 1080p isn't 1080p, or is scaling up the image for some reason!
All my graphics drivers are up to date. I ran this game on my previous computer, the screen of which had a resolution of 1360x768. Could Steam be saving some data about my PC, and think I'm still running on my old system or something? Just a thought.
Any thoughts or help would be greatly appreciated!
My specs are:
i7 7700HQ
GTX 1060 6GB
16GB DDR4 2400MHz
256GB SATA 3 SSD
1080p panel
It's a laptop, the model is the Acer Predator Helios 300.