A lot of speculation going on here.
Ken and Ali, I grow all sorts of Neps but mostly lowlands and species. The truncata is a highland form and when it came it was put together with my lowland plants. It didn't quite like the sudden drop in humidity and rise in temperature. Many of the S'poreans have this form from BE too but I think their plants are doing much better in more constant humidity. The pitcher is slightly deformed probably because of my irregular watering. The plant is in one of my rooms and I sometimes forget about it.
cpnut, the eustachya is in a bright spot without direct sunlight. I have not tried growing it in a place with direct sunlight before but I think it will only bring out a brighter red. It isn't obvious in the photos but one side of the pitcher is more red...the side facing the direction where the light comes into my balcony.