Sometimes if you're still in melee range with a mob (and this usually happens when you have 4-5 or more on you in melee range) and it melees you as you FD it cancels your FD.
Basically the mob is hitting you mid-fall and realizes you aren't really dead so they keep going after you. Try to put at least a jump's worth of distance before FDing or FD around a corner or time your FD in between hits for best effect.
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