Bird of Paradise Leaves Won’t Open

Question

I have had this plant for three years. It blooms, but for some reason the leaves will not open up like it did before. My other plant is fine, leaves open and shiny. I live in NC and the plant is outside now, though I bring it inside for winter.

Answer 1

One of my BoP, in a 25 gal. nursery pot, has a few leaves that have not expanded like the rest. There should be a reason this has happened, but I can't figure it out. They are from the same parent plant, same soil, same temps, food, water, light, and any other variable. They have the same bloom count ratio and bloom quality. I find no information to explain this "condition".