About a foot of loose ends
The way my hair dreads up, naturally, is like an inch (sometimes less) dreaded and the whole other like 8 inches of my hair loose. It's been SLOWLY dreading further down on some.
I guess there are just a lot of different factors that determines the way our hair dreads, and what it does during the process. It is common for dreads to completely fall out for various reasons. I've never heard of it beingrecommendedto re-do any starter method, so I guess you just gotta give 'em time. Why don't you do like a sea salt spray or something to encourage some knotting, though?