What you are refering to is something called Curling.
Why does this happen?
Mostly plate dehydration. When the natural nail plate is still attatched to the bed, oil and moisture continually move through the plate, keeping it sealed with goodness. When the plate leaves the bed and becomes the free edge, the plate dires out as it no longer receives moisture and oil.
When that happens, the plate compresses and (depending somewhat on the structure of the plate) it curls up.
Think of it like this:
The nail plate is similar to a sponge. All porous and stuff.
You take a sponge and drop it in the sink, it absorbs dirty dish water and swells.
You take it out of the sink and set it on the counter, it slowly dries out and shrinks (it also leaves a really funky smell behind).
In the water -> it sucks
out o the water -> it spits
suck.spits.sucks.spits.
This sucking and spitting thing also can play havoc on the natural nail plate.
When you soak your plates in water, they suck... take em out... they spit.
What to do? Ditch the creams they will do little to squat to help out.
Use plenty of light grade cuticles oils (hint: Solar Oil) to keep the plate sealed to help prevent sucking and spitting.
What else? Wear enhancements... they can help to hold the plate straight.
Here is something funky:
Ever seen a parrots beak nail? Its a stupid technical term for a severly hooked nail (I mean really... is it derived from parrotusbeakaramus... latin for 'hook'?!?).
Soak it in water for twenty minutes and guess what happens? It goes straight. Guess what happens when it dries? Yup... hooks down again.
Tooooooooooodles