I'm having trouble with my Cobra lily, and I hear this is a common enough problem. All of my pitchers are very tall and beautiful but they never develop the large heads or tongues they are known for! I keep them in almost the exact same conditions as the place I got them, bu they still do it! Also, my pitchers appear both wet and dry. One set of pitchers got so wet that it flopped over(these pitchers swere almost a foot high) And another is so dry that it's breaking! BOTH ARE IN THE SAME CONDITIONS!!!!! A third fourth plant is fine!!! HELP!

All in same conditions/soil/light/humudity/ect
Plant 1- tiny, tall pitchers
Plant 2- wet, floppy pitchers
Plant 3- dry, flopping pitchers
Plant 4- completely fine