I dont know what is wrong with it. Feeding schedule has been on time. I be feeding it 500mL every other day. I mix rhizotonic, Cal-Mag, Coco canna A+B, into 5 gallon mix with Ph around 6.0. Ppm was like 1050
I don't use Canna nutes, but when I see that i cut down my nute strength.
For a plant that size, using Blue Planet nutes, the PPM would be significantly lower.
I also see that when I use a lil too much humic acid and kelp in my organic grows.
But it could be a strain specific thing. You can check some grow diaries and see if you spot it as a trait...