Bent fork. This fork has bent at the thinnest part of the crown on both legs. The fork legs should be in-line with the head tube.
Symptoms of a bent fork are (1) heel striking the ground more frequently in corners, (2) front wheel mud-flap dragging more frequently over debris and bumps, and (3) an increasing reluctance for the bike to corner predictably at greater lean angles.
If your fork looks like this, it is bent and should be replaced.
