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Not sure if it's because i used it in conjunction with voteevent, but  using voteevent followed by voteff causes ff to remain enabled.

voteff turns on friendly fire and keeps it on.
Some event rounds turn friendly fire on for 1 round only and turn it back off.

You may not have the permissions to turn friendly fire back off so probably avoid using voteff (as I think there is no way to turn it off, unless maybe you voteff again?).