This happens only when you are not the only person hitting the add/boss and you are only using FESTERING STRIKE & SCOURGE STRIKE/CLAWING SHADOWS. If u use another abilitie like OUTBREAK they wont ...
Wow freakz: https://imgur.com/zWwzCBd
Bug description: You cant skin in legion with 1 skill point as skinner. You should be able to.
Proof: https://imgur.com/a/DLL1o7p
To make it short NOT FIXED.