What's going on here! (Chokes on bile and tonight's dinner)
Rajah appreciates very high humidity espeically at night, needs near 80% plus. What are the temps your getting for it? Little info for you:
Temps- Day under 85F Night 50-55F ideal.
Light- very bright for pitcher coloration and good growth
Soil- I use pure living sphagnum, looks like you got it in rocky substrate mixture. That ok but make sure the rocks were well washed and NOT calcium inhibited rocks. (no limestone or sedimentary rocks).
Water- Rajah seems to be picky and therefore appreacites pure water in cultivation (distilled or RO water is best) rainwater would be acceptable for a while.
Humidity- above 80% for best growth and pitcher production, your plant is still quite young and keeping humidity high will keep it healthy so it eastablishes good and becomes a larger healthier plant.
And feeding- rajah does best with those tiny ants on the sidwalk and the pinhead sized crickets from a petshop are also excellent.
That's about it the temp,humidity, and water are probably the MOST important of all. I am surprized you didn't research this plant before you ordered it, I thought you did!
Good luck!