I’ve seen this posted on Nov. 16 in another merged thread, but I’ve since heard several complaints from other elementalists. When Magnetic Grasp is used on a mob standing on uneven terrain, the elementalist gets stunned, floating in front of the mob for the duration of the immobilize.
I’ve seen this happen on hills, ramps and stairs, both ascending and descending. It is most unreliable on rocky terrain like in Sorrow’s Embrace, where any small rock will prevent your leap from reaching the boss.