Carpet problem
You might have to pull the carpet back and see what type of spot there is on the secondary back of the carpet. If its mold you could clean it with bleach and water. If its permanent you might have to replace that area of the carpet. The other problem you might have is, in the concrete someone might have spilled a solvent that keeps wicking through the carpet, if thats the case, you have to clean that area of the concrete. Being in this field before I retired I think this might be you problem.
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