I'm not familiar with that kind of mp base, so I can't tell you if it's something from the ingredients making it extra moist.
How are you melting it? Is it covered when you're melting it? How hot are you melting it at? Are you putting it in the freezer?
If you're covering it while melting, that will trap the moisture in the soap.
If you put it in the freezer after putting in molds, then that adds moisture to the soap.
MP is usually a sweaty beast because the glycerin attracts moisture from the air. There are some ways you can help get rid of the moisture.
After unmolding the soap, wipe it down with a paper towel, gently. Then wrap it right away.
Or, what I do is I let mine sit out to dry out for a few days. But I live in Wisconsin where the air is usually pretty dry, so that may not work for you. But, some people leave theirs to sit out and have a fan blowing air on them.