Natural soaps like ours, rich in natural glycerin, are the most moisturizing soaps you can find. It is this glycerin, like other natural humectants, that readily draws moisture out of the air and onto the soap. When this happens, the soap looks like it is sweating. This is more likely to happen in humid environments. Nothing is wrong with the soap. It is just doing its job.
Washing with natural soap leaves a thin layer of glycerin behind that draws moisture to the skin. This beneficial glycerin is removed from most commercial soaps.