I've read that softneck varieties were bred to "not-scape", but will generate scapes when stressed.

I have softneck varieties that scape consistently and hardneck that sometimes fail to scape. No hard and fast rule when Mother Nature is involved, it appears. Too many variables.

I too experienced my softneck variety producing scapes this year. I believe i read somewhere that heat can cause this..I can believe that because the last 10-12 days they were in the ground (pulled 10 days ago), it was extremely hot, I live in Dayton, OH. Besides the 'off' winter i think everyone had, i would definitely say they have been stressed this year.
I suppose my predisposition to selective planting for larger bulbs, longer storage, ...no scapes on my softnecks..., will lead me to keep them separated & Not put any of those that set scapes back into the ground.
???

Thanks for all the replies. I'll make sure to only replant bulbs that didn't send up a scape this fall. Hopefully we have a normal winter this year. I've been having trouble with more insects than normal this year and I attribute some of it to the unseasonably warm and short winter we had.