(Most important) Storm, Earth and Fire Spirits do not benefit from the Dance of Chi-Ji Azerite Trait which lowers the damage it should do by ~55% during the cooldown.
Fury of Xuen has a tooltip bug which displays it at 2% per stack when in reality it is 1.5% per stack.
When gaining large amounts of haste via a proc (Fury of Xuen, Bloodlust, etc) you can run into situations where you will be unable to use Whirling Dragon Punch even though Rising Sun Kick and Fists of Fury are on cooldown
Mark of the Crane has some weird things going on with it where sometimes your spirits during Storm, Earth and Fire will apply the Mark of the Crane debuff but you won’t gain a stack for Spinning Crane Kick. Additionally you will very frequently not drop stacks of Mark of the Crane whilst only fighting 1 enemy for a large amount of time.