Hello,
Are you referring to the fact that this jutsu only affects male ninjas? Are you attempting to affect female ninjas with the jutsu? If so, this is not a bug, it is a feature. From what I recall of this event, there are a number of female ninjas on the field.
If this is not the case, can you be more explicit about what ninjas you are attempting, and failing, to affect? Do you have any screenshots or video of the mystery failing to affect them?
Thanks!

Interesting. Alright, I'll forward this to the devs and ask if this is intended or not and let you know once I hear back.