I recently realized that my fork seems to be rotating in increments.
What I mean by that is basically that if i hold the bike up, the fork won't rotate smoothly. It basically snaps to random points (straight, about 45 degrees, almost 90 degrees, and 90 degrees). I realized it couple of days ago when i carried my bike up the stairs to my apartment and found instead of needing to hold the front wheel like i used to do (its a really narrow staircase) the wheel basically snaps in position and wont budge unless u manually move it with ur hand. Then it'll rotate and snaps to the next increment.

I tried loosing everything there is except the headset on the fork to no avail. What could possibly be wrong that this is happening?