Lethal Pride Timeless Jewel won't go in socket

The socket is allocated and open, but I can't place the timeless jewel into it. I can put a base jewel into it with no problems, but for some reason this timeless jewel will not go in. Iv used a timeless jewel 100 times before without a problem, I don't know if they've changed something or it's just a bug.

SIKE, I forgot I had another timeless jewel already in another socket. HaHAhahAhahahAHSd8jhaif one of them days nom sayin.