Remove event 8.
Your object gets stuck when doing two attacks consecutively in the air.
This is because after the first one, you set velocities to 0, which I believe invalidates both the is falling and is jumping conditions. This makes it trigger event 8 which is w pressed when not on floor, switching to the fumble wham animation. Since the jump attack animation never finishes, event 33 never triggers and gravity never gets enabled again.