Since you got your seed in October (not too long after they were pulled from stratification) and you planted them right away without storing in fridge or otherwise...
That is ideal situation.
Something may have gone wrong in the stratification process on that batch, who knows.
The worst luck I ever had was with seeds from a source other than wildgrown, that was also a very reputable dealer. I had about 10% germination that first spring, and the next spring about the same.
I bought those seeds late in the year though, bought them in January and planted as soon as I got them. I figured that had something to do with my problems with that batch.
Since then I don't buy seeds late in the year. I like to buy in October or November and plant them asap after they arrive.
I have also seen what BCastle mentioned... some 3 leafers still coming up in my patches into the 3rd spring after planting. I think that is all a part of the creators plan for this fine plant surviving even though it gets abused by many.
TNhunter