I have noticed that the keg spells the Monk use, whether Keg Smash or Dizzying Haze (the range aoe one), only occasionally applies the Dizzying Haze debuff that then allows the targets to be lit aflame with Breath of Fire.
When I practice this on target dummies in town, the Dizzying Haze debuff is always applied and things seem to work as intended. But in dungeons, that same debuff will only be applied sporadically – about 25% of the time.
Looking at logs with tank monks in raids, I am seeing this same issue reflected in the numbers. Entire bosses in DS will not be afflicted with Dizzying Haze and nets ~30% uptime on all bosses when the raiding Monks are spec’d to tank and indeed using the corresponding spells to apply said debuff.
i noticed something like this when i was lvling i chalked it up to lvl difference in dungeons