Since I upgraded my monitor to a 4k, I can't take full screen screenshots anymore.
My current resolution is 3840 x 2160, but when I press print screen, it only takes a 2560 x 1440 portion of the screen from the top left corner.
I think it may be due to some scaling windows is doing to the UI so that everything is not too small, but I don't want to make everything small either.
I didn't find any good info on Google, only results talking about how to take a screenshot bigger than your resolution, like how to take 4k screenshots while being in 1080.
If it's related to my graphics card, I have an Nvidia GeForce GTX 660 Ti and my monitor is connected through a display port.
Also, I'm talking about screenshots of desktop or common applications, not games or other fullscreen applications.
Also if I try to screenshot only an application such as a Chrome window using alt+print screen, it takes a screenshot of the right size (of the browser), but it's offset to the left and top.
Edit: I have a screenshot software installed (Purrint) that is auto-saving my screenshots, but I didn't think about it, because I was pasting my screenshots in Photoshop, turns out it was modifying the screenshot in the clipboard as well or something.