I can't agree with you more mate.Those fears should do what it says in Descpition of spell.Therefor i did a test.After 6 fears of 7 seconds.And 6th fear cancled after 5seconds."I was playing afli warlock".This means the rate of actually canceling the fear is small.
Good luck and wait for admins to reply.
I would of suggest you to make a thread in bug tracker section