Satins with wavy fur???

So my satin aby to satin litter is opening their eyes...and I am a touch puzzled. It's my very first litter with satin, so it might happen everytime, but my little ones have wavy/curly hair! Whiskers seem mainly straight with a few slight kinks. Is this something satin's go through because of the hollow hair shaft? Or do I have a surprise?
Mother is a standard with no rex in her pedigree. Father is an aby buck from the imported stock.
Here are some pictures of the little cuties!

My satins (short hair or long hair) have not done that unless I had a rex parent. And that doesn't look quite like rex, as it's concentrated on the shoulders and then dissipates. There are supposed to be more curly-haired genes, but I don't know anything about them.

Wonder if it's an odd side effect to the abysinnian...like a marker for being het for it.... weird. Cute but weird. Time will tell if they outgrow it.

They look wavy only in the middles of their bodies. I'm thinking it's the unformed Abyssinian swirls. Stina should know. I think she had some satin Abyssinian babies.

The breeder would also be able to answer that question, and to tell you what the chances are of having had something else going on there. These are from laoshu on FMB, if I remember correctly. Her name is Kelly. I'd have to open up my FMB to be certain if they're hers, but I'm pretty sure.