Major Z-axis issues
 

Enchanter nukes with stun component are pushing mobs directly up the Z axis. If you are in a building with a low roof this will push them a good 1-2 floors above you. Have not tested any other class spells.

The last time I played an enchanter was about 4 years ago on red and this did not happen so I'm not sure if you intended it or not, but seems pretty wrong to be pushing mobs through ceilings.

It's not just chanter nukes. I've knocked mobs through ceilings with shaman dots initial damage. Mobs running towards me bug out graphically when they get hit with these spells: they appear to freeze in the spot they were when the spell landed, then a second or two later warp forwards and are running as expected. Stuff like that.