What ElPollo was talking about is a chimera - when two or more genetically distinct cell sets meet in one plant. The easiest to undertand are plants with variegated leaves but grafted plants are also chimera. But, the second cell set can't be invented, it had to be in the plant genetics to begin with. There are variegated Loropetalums. Is yours possibly variegated but the variegation has been "lost" (DNA is never lost, just misplaced within the plant)?
What I suggested is anthocyanin degradation, usually caused by environmental stresses. For some reason, the red in the leaves degrades and allows the green to show through. Red leaves in too much shade will lose anthocyanin but not usually in a pattern. That's what made the kale article interesting.
The chlorophyll is obviously there but masked by the anthocyanin, otherwise your plant would not be alive. So where did the anthocyanin go? Maybe your plant is a closet chimera or maybe environmental stresses caused the anthocyanin to degrade in interesting patterns.
Or it could be a hickup and the plant will never do this again.
