I realize that it's been a long time since you wrote in with your question, but this might be helpful for next year.* I'm thinking that 8 weeks weren't long enough.* I would suggest that you keep them in the refrigerator for 12 weeks.*
Another possibility is that you had apples or pears in the refrigerator at the same time the bulbs were there.* Apples, pears and other fruit release ethylene gas and damage the bulbs.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.