I'm not sure about the leaves, but I agree with the others. That stem looks like it's too wet. I've lost several prized plants to the same problem. Try stripping some leaves and carefully potting it up higher on the stem with a mix that drains well. I'd add soil around the roots, water, then put dry on top around the stem. Add a fan for some airflow. I can usually save 75% if I catch them early enough.
- CMJ likes this