as Eckhard wrote, maybe a hybrid, or maybe a mix of seeds? Who knows? Anyway, an interesting deviant seedling!
Natural hybrids, even species between not closely related Yucca are possible and not so rare! There are even many specimens in their native habitats, which show specific features of two or more species. It might well be that it is an putative native hybrid of Yucca cernua x louisianensis, both are native to the Jasper and Newton Counties and their flowering season overlaps. And it looks just exactly as you would imagine an intermediate hybrid between these two taxa. Keep an eye on it and make a photo documentation with details and macros for you and for us. And try necessarily to produce fruits. Good luck!
bye,
Jorge
"Die Freude an den Palmlilien wuchs mit mir und wurde zur Leidenschaft " "Man müßte alles tun, um Früchte zu erzeugen, ..... um der Wahrheit auf die Spur zu kommen" Carl Ludwig Sprenger