Orange peppers on a ghost pepper plant?

[fonseca]

I grew three ghost pepper plants from seed this year, from the same pack sourced from Baker Creek. Two of the three are putting out lots of deadly pods that ripen to dark red. But the third plant has pods that will not ripen beyond orange.

Did I get a color variant? They have been at the orange stage for 6 weeks now! I think I can assume that they are not going to turn red. In the last few weeks this plant has started to show signs of nutrient deficiency, as all leaves are light green/slightly yellowed. New leaves start healthy but lighten as well. Is that because the peppers have been fully-ripe for so long without being harvested? My guess is stress, but I'm at a loss here. I believe the peppers are fully-ripe, because I ate one and it melted my face.

Unfortunately many of the peppers have sunscald because they have been on the plant so long.