It takes a plant time to adjust to any change in environment, some more than others.
I have had plants going near dormant for up to a year before they "took off"!
I'm not sure where you live, but in general I have found pitchering very dependant on
humidity. Lack of humidity, less, smaller or no pitchers at all.
Light is the next requirement.
It seems you have "sun-burned" the plant by exposing it to strong light too quickly.
I have done this often, and occasionally killed plants this way.
If you are going to put a plant into full sun, begin a little at a time. Morning or afternoon sun only,
or semi-shade... for a week or two. The slower the change the better, and use the plants actions
as a guide. It is better to change a plants environment/conditions too slowly than too quickly.
I am sure you will get conflicting opinions, as we all have our own little micro-climate/conditions that
vary from one another... however this is what I have found true from my experience.
(For example, when I speak of "micro-climate/conditions",
your planting medium will determine how much and how often to water...etc.)
We all have slightly different variables, that affect a plants growth.
While some "general rules" are to be followed, you have to be open-minded enough to find out
what works best for you. "One size does NOT fit all" so to speak!
Good Luck!