This requires a bit of explanation honestly, I have f1 through 12 but if I just press them on their own they do things like "Raise/lower brightness" or "turn on airplane mode" or activate the keyboard lighting, if I actually want to press the function keys themselves I have to press alt as well, DO YOU NOT REALIZE WHAT ALT F4 DOES BY THIS POINT
@ohtorifightclub This sounds weirdly familiar to something that happened to me on my old keyboard...
It might be your keyboard has a "Function Lock" (Fn Lock) key, or you need to hold the Fn key and press... whichever button the Fn Lock is on? to turn them back into the Function keys instead of their media keyboard/brightness/sound functions.
... Might be Fn+Esc? Possibly??
@ohtorifightclub ooh, could also be under Windows Mobility Options if you're using windows.