Icestorm keeps binding to left click

Whenever I move to a new zone, icestorm gets rebound to left click, I have it bound to mouse button 4, but it unbinds that as well. I haven't had this problem with any other skill, though this is from the only item I have that has 2 skills on it.
Bug Report ID: #1751950702

Small update, I now have an unborn lich ravenous staff with 2 skills as well, and the second skill acts the same exact way as the icestorm where it gets rebound to left click or the left most empty hotbar slot.