The insert should not be split.
It somehow got damaged along the way.
It should be inexpensive to fix, as long as you can get it out of the tapered spine spar.
Be very careful though, split carbon spars can give you a very nasty splinter.
Thanks. Getting it out isn't a problem, it's not glued in. There's only a stopper glued onto the insert, which slides freely into the spar.