"Drift" is another term for understeer which is when the rear-end of the car loses traction in a turn. It tends to be easier to induce (accidentally or on purpose) in a rear-wheel-drive car.
I should note that my ~2005 MY Ford Focus would absolutely understeer if you enter a turn too fast without applying power.
Are you lifting right before you start to turn in? That'll do it, because lifting off the throttle abruptly will shift weight to the front, which will unweight the rear; and sometimes that little weight transfer is all it takes to break the back end out a bit. (Used to do this regularly in a Taurus that I had the pleasure of driving for a few months.)