Carpet glued down inside? Never heard of that. Is it the carpet or is there a sewer etc line leak under the floor that the odor is coming up into the RV? Yes, mold between the carpet and the wood or in the pad under the carpet could be another cause and depends on which carpet shampoo you are using. In over 50 years so far we've never had any smells coming from the carpet in our homes, RV's, or boats even in the carpeted bathrooms and the toilet areas. Has to be a reason of course you have smells and shouldn't be that hard to find out why.