Lich Form: out of body experience

It often happens that my character becomes invisible (and other player characters as well), right after leaving Lich Form. I still see the Lich character standing frozen right where I left Lich Form, after a while it transforms into my own character, still at the old location. After a while my own character is correctly showing in its proper location, but other players around me are still invisible, just leaving their name tags floating around.