My nepenthes was growing very well for about 4 months, doubled in size and put out little plantlets from the base. But now leaves were turning black (two months ago). So I cut em back because I read it is natural. But now more leaves are turning black. I've attached pictures. I haven't changed its location. I took it out of its pot today, roots firm, no rotten smell but the media was too wet, way too wet!

Suggestions? Should I trim? Cut off the weird parts? The tip is growing very well. Is it stem rot?

Thanks!