My Battle Standard exists for 36 seconds yet it has a duration of 98. The buff doesn't persist once the standard expires nor when leaving its range, so the buff only exists for as long as the standard itself: 36 seconds.
As best I can tell, that 98 seconds refers to nothing at all.
Is it that the buff is supposed to last for 98 seconds after leaving the standard's range (or the standard expiring), but is failing to do so due to a bug?