Weird bugs regarding type tool, arrow keys, possibly more

Hello,

I have this weird issue with Adobe Illustrator - not sure what's causing it, honestly. Whenever I place a type, it's oriented vertically (not vertical typing, but as if I've rotated the text 90 degrees). Furthermore, when I use the arrow keys, their responses are really weird - the down key nudges right, the up key nudges left, right arrow moves up and left arrow moved down. I have no idea what could have caused this, as I haven't really fiddled around the Illustrator preferences (can't even find anything there that would skew the overall orientation of my inputs in this way, or indeed, why such an option would even exist :)) I don't exclude the possiblity of other tools being "inverted" in this way as well, haven't encountered them yet.