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It could be a change in the materials/manufacturing...
I'm not trying to be a smart ass, but do you or your neighbors have a cat?? [emoji75][emoji75]
yeah, no cats have gotten in there...I think it boils down too being that I put it back in the truck while it was still damp and it got all musty and stuff being in the topper. the cat pee smell is the closest thing I can compare it too...have smelled that smell before on things that were wet and have gone funky.