FPC Moves itself

Hi, so I have opened up a brand new world, placed only a terrain and an fpc and then the fpc moves forwards and to the left by itself. I don't know how to fix this, I've asked my tutors at college and they don't know, I've tried unplugging all my input devices incase they're faulty and it still does the same when played. Its not something wrong with the world because I can open the exact same game on the college computers and it works fine so I'm just asking for some help. I don't know what this may be, I'm thinking maybe I have a setting on my home unity that shouldn't be set, any suggestions to how I may be able to fix this unwanted movement? thanks