Interior trim delaminating

A piece of trim along the floor below the electrical box in my Rpod 179 is delaminating. I removed the panel cover, but can’t see any source of moisture which would explain what’s happening. The trim seems to be made of plastic-wrapped insulation material which is bursting out of its wrapper..  Has anyone had this happen? Any suggestions?

Thanks for the suggestion. I don’t use the “shower” much, but I keep the R pod plugged into shore power during storage, so I suppose the converter could be running. I’d like to remove the trim piece and just replace it with wood trim.