Strange flash zooming or me going mad

Hi!

This little odd to explain, but i’ve always thought that when you zoom out to anything below 100% zoom, everything in the stage and work area is positioned in the centre, with rulers going from -0+(If that makes sense?). It may just me being mad, but mine always zooms out shoving everything to the top corner, making it near impossible for me to change anything thats minus in the x and y (in the editor, nothing to do with code). Did i accidently press a keyboard shortcut to make this happen, or has it always and i am just loosing my marbles?

:-/

Anyhoo any help would be awesome!