Yup! There (in my Milt experience) are two types of flowers: ones where the lip unrolls like an ice cream cone as it opens, and ones where the lip and petals open like you're spreading your fingers outward from a fixed point.
I've had problems with the kind that unrolls. The first few flowers open nicely, and then the others stop, partially unrolled. I asked an AOS judge on another forum about it, and here was his reply:
"Most of my miltoniopsis have no problem opening up their blooms. However, sometimes they bloom just great and the next year rather mediocre. Most likely it's culture (fertilizer, mix, light) although some plants are genetically weaker. I think that the conditions of the plant while the spike and buds are developing are very important, and they bloom better under cooler conditions.
Some of the waterfall plants with very intense patterning have problems opening up well, and I know that some breeders will try to lighten up the intensity of the pattern in their hybrids.
My plants are blooming like crazy right now, and it's the most amazing display. Some of my favorites don't look as well and others are putting on a show. Why?
As far as watering, I keep them pretty wet and that takes care of any accordion-pleating in the leaves. As long as you repot annually it isn't a problem.Try to keep them evenly most but not soggy or you will have rot problems."
It would be helpful to know what parentage contributes to the way they open, so that you could avoid those crosses. But I'm not a Milt-head.
Hope that helps! Sorry yours isn't doing its thing - I understand your frustration!