No idea, Ted. I'm flabbergasted that it has reverted too. This was a "bargain" plant that I got in bloom from Costco in 2013, with (of course) no tag. So I don't know the original name and can't guess the parents.
It has never bloomed dependably, wanting the cool damp weather to set flowers. But 5 years after I got it, it put up the above - one nice spike of the cream blooms. Then it went about 3 years with no blooms, and popped up with these orange ones the next time it did anything in 2021. That was the year I divided it, in an effort to isolate the orange blooming plant, and see if the cream one would return.
I do still have another division from that, and despite same care, same location it has not put up any spikes that I can see. So I have to wait for another year (or more) to see if I still have the original plant. There's a smaller div in a small pot, too but it is in a different location, might come along later, let's hope.
This is what it looked like when I got it. I bought a yellow one at the same time that only lasted a year or two. They really were magnificent, though.