The simple term "Sphagnum Peat Moss" is so terribly confusing, Tarev. Did you happen to read the article I wrote describing the differences between peat and sphagnum moss? Then there is milled sphagnum (unadulterated), milled sphagnum with fertilizer (as you noted), standard, long-fibered sphagnum, and premium, long-fibered sphagnum.
How do you know when to re-pot/up-pot your Nepenthes?