Umm, I'm stumped and I'm sorry. I can't imagine them not working, but I believe you. Do the new ones have less toxins or something? I don't get it. The strips wiped out my mites the 2 times I had a problem. 3 days, all gone. Just like that. The best part was looking at the eggs under the microscope, and seeing the babies dead in their tracks as they tried to emerge.

Can you turn down your ventilation for a couple days? or add an extra pest strip or two? or both?