Hello, NeXuS_DeSiGn, welcome!
According to the reference you give for the solvent, nonane-decane-undecane are alkanes, the usual type of compound in naphtha, but trimethylbenzene is an aromatic compound, like toluene.
I've seen that undecane has a pretty high melting point of 27-25ºC, which would make it precipitate itself in a very cold freezer. But then the crystals would have redissolved at ambient temperature. Other than that, my guess would be those crystals are simply wide spectrum alkaloids, more similar to the pulls done with aromatic compounds like xylene or toluene. And perhaps there's traces of other plant oils.
But I am NOT a chemist. And if I were you, unless someone who knows his stuff like benzyme or Inmotion or any local chemist reassured me, I'd redissolve the crystals and either wash them, pull again or do a re-crystallization with a more selective and familiar type of solvent.
Good luck with that.
"The Menu is Not The Meal." - Alan Watts