What would cause my electrode to melt into this shape after about 6" of welding? It's 2% thoriated tungsten ground to a point DC welding 3/16" steel 150A. I was playing with the pulsing from 2-10pps. I found a chart and the closest thing I could compare it to was touching the filler metal to the tungsten, although I'm 99% sure I didn't...? Done on a Syncrowave 200. Any help would be appreciated

This was the second time around after about 6" of welding: