Hmmm ... I can't say I've noticed floppy or curly leaves on blooming cattleyas before myself.
If they have a unifoliate background, then they should have a single, big, erect, firm and turgid leaf per pseudobulb. If they come from a bifoliate background then there should be two leaves per pseudobulb, which should lay more or less horizontally and point away from each other rather than upwards. These leaves are generally smaller compared to the pseudobulbs, which in turn tend to be thinner and less clavate (thickened in the middle)and often longer than those from the unifoliate group.
I've just been to the greenhouse to check and I think I see now what you might be refering to. The leaves of the bifoliate group are a little bit ... curled? ... along their length compared to the straight leaves of the unifoliate group. If all your plants have unifoliate background then they should indeed be straight and there's nothing you have to worry about.