Why can't I scale/rotate/translate properly and what is that orange line? Whenever I try to move/scale or rotate and object (I'm zoomed in) the orange line appears and the object gets reeeaally big and is deformed :/ Whenever I'm zoomed out that line doesn't appear any more.
It didn't happen before, what should I do to fix this?
Snapping mode is turned on, and your scaling operation is snapping to nearby geometry, giving you unexpected results.
Simply turn off snapping mode (hit Shift+Tab) and your issue should be resolved.