I bet they did not get chilled long enough.
Im totally defeated this morning. After all the bragging about the sponges, and how I had salvaged my season, something came last night and just ate every last one of them. Mowed them right down, Left a few little leaves to torment me. These seedlings are right outside my bedroom door, and I am going to make at least one of the dogs sleep out there from now on, I think I might even check into a motion sensor light. I think I get the message....no new seedlings for me next year.