First rebloom - weird four-petal flowers!

[Sevelina]

This is technically my first rebloom, even though I didn't really do much to contribute. It still feels like my first, but maybe it's more like 0.5. I got this Noid phal at Trader Joe's, because I really liked the slightly mottled leaves and unusual soft pink flower petals. The orchid wasn't in very good shape: the root system seemed underdeveloped, flowers looked sad, and spikes looked so thin, though it didn't show signs of disease or pests. There was also a "pretzeled" spike that grew back into the stem some time ago. I probably wouldn't have gotten it based on its physical condition, but it really stood out to me among all the other phals I've seen at Trader Joes, Lowes, or HEB, so I brought it home!

After repotting, I decided to cut the sad-looking flower spikes so it could concentrate on growing stronger and building a better root system. However, it decided to put out a brand new spike! It really took me by surprise, but I got quite excited. The spike grew from the back side of the stem, snaking underneath a leaf towards the sunlight. I don't think it had enough energy to make a very long spike, so the buds formed low - lower than where I could stake it!

I came back from vacation to see that two buds opened up - and what a surprising discovery to see such strange flowers! They both have only four petals! Whaaat! I have never seen anything like this before. They don't seem peloric, and all the flowers on the spikes I cut off were normal. The size of the blooms also improved. I'd say they're about 30% bigger this time around. I don't have a photo from when I got it, but the last picture attached (which I found on Google) is almost exactly like it was. The picture identifies it as Jiaho's Pink Girl Little Plum Blossom, but who knows with the Noids. It definitely doesn't look like the Pink Girl proper.

Is it possible that the mutation happened due to insufficient sunlight during bud development, since it was under the leaf for majority of that time? I am really curious to see if the rest of the buds set and bloom normally or similar to these. Maybe it's just doing too much at the same time? It just popped a brand new leaf and has 6 new root nubbins (yay!!!), so perhaps the flower formation just isn't the priority.

It's not the best display, but we all start somewhere...?

Edit: I confused petals and sepals! After doing some research it seems that the petals are all there, but the top (dorsal?) sepal is missing. So much to learn.