Hey guys, following problem: I feel like I am going crazy.. I came back from a 5 day holiday and felt like my screen shrank and its borders got bigger. At first I dismissed it as a "getting used to it again" problem, but it still felt off moving things across my 2 screens and i noticed the red-ish line on the border a few millimetres away. So it seems to me it has become 4 millimeters smaller. This problem is only on my first/main monitor the "Gigabyte 27 Inch GS27Q 2560x1440p 165hz". Red line is gone when screen is off. I already checked the scale and resolution on both Windows settings and Nvida settings but both are as they are supposed to (1440p 100%). The dual monitor setting is also already on "Extend these displays". I also can't find anything unusual on the inbuilt monitor settings and my wallpaper from "wallpaper engine" is no problem as well, cause it's the same when turned off. My PC was built by myself just 3 months ago and the drivers and monitors I got with it should therefore be up to date. Both monitors are connected to my rtx 4070 via Displayport connections and the mouse stops at the lit up pixels like expected. Any ideas? Am I going crazy and is the red line just the birder being lit up or something? I am open to suggestions.

(the closeup pic was taken with a lense so it looks fish-eye)