A 14-inch pot is large for a 4-foot Strelitzia. Overpotting leads to wet soil and root damage. Loosening roots is good; breaking strong roots harms the plant.
Splitting along lateral veins is a wind-adaptation mechanism. It's not a disease. To help new leaves unfurl cleanly, mist the emerging leaf with warm water and gently rub the reddish edge to encourage separation.
Likely from root disturbance during repotting. Roots should heal; future leaves will be normal.
To limit growth: stop repotting, reduce light slightly, and cease fertilizing.
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