I can't really tell from the photo what type of white powder you're talking about.
What type of substrate do you have it growing in?
Overall, at least from what I can see, it doesn't look "unhealthy." Leaf coloration looks a little on the light side for what I prefer to see in my nepenthes, but it could just be the photo. Looks like you've got a Florawave light (if I'm interpreting that receptacle correctly). If so, light levels should be just fine.
If you're seeing a white powder on the leaves, 95% of the time it ends up being white powder mildew (https://www.gardendesign.com/how-to/pow ... vegetables
.). Heads up on that one.
I will mention that I have about 27 nepenthes growing right now. My ampullaria "Black Miracle" appears to put a white, semi-sticky "powder" like substance on it's leaves. It isn't white powder mildew though, as I can almost brush off the powder, unlike any mildew, mold or fungus I've encountered, and the plant "grows" the powder back. It's the only nepenthes that does that, not even the other ampullaria (Red x Black Miracle") that grows right next to it. Strange, and I haven't quite figured out why it does that. But it's growing just fine for me, good coloration and it's pitchering (it prefers warmer conditions than what it has, so it's actually growing a little on the slower side). I've never grown a klossii before, so maybe it's putting off that white powder on its leaves like my BM is.