by this you are addressing the fact that setting the Duration to less than 6 seconds this happens right?
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Basically yeah.
With a duration of less than 6 sec like your example you get the Birth (1 sec) sequence, one or two Stand (2 secs each) sequences, then it abruptly cuts.
With a duration of exactly 6 sec you only get the Birth (1 sec) and Death (5 sec) sequences.
With a duration of more than 6 sec you get Birth, a few Stands and Death.
Cyclone is a weird ability like that. Essentially it will devote 5 seconds of its duration to the death animation and skip it entirely if the duration is less.
I might be wrong of course and there may be a way to work around it, potentially with gameplay constants and such.