There is a bug that if you are resting and someone "interrupts", you will keep the resting regen rate once you get up and can cast jutsu and still attack.
Another bug is with the WIP skill tree, when you put points in HS passive if you relog your HS rate returns to the normal rate without the passive no matter how many points you have invested...pretty sure there were more bugs but because it took me so long to find the motivation to post I seem to have forgotten a few lol.