Missing Frost Witch's shoulder animation

I guess this is not so important because it's just a visual bug, but it bugs me because i dont know the reason of it. I have Sanctified Frost Witch's spaulders (25 HC healer version) but they never proc the spectral animation. I have seen it on others, even with the exact same shoulders or ele spec version of these. Though they all had at least 2 other 25 HC set pieces. Maybe that's the problem? I have max video settings, and i also have frost witch's handguards if it makes any difference.