You've said the leaf had opened normally, and you found it rolled up like this later, then it righted itself later in the day. It looks as if your plant is indoors, and appears to be in sunlight through that window - if the sun was very strong yesterday, and you noticed the leaf rolled like this between 11-3pm or thereabouts, and it got better after that time, likely the sun was too hot through the window. Presumably only this leaf was affected because it's the most exposed to sunlight and it's a younger one - the ones beneath will have been sheltered to some extent prior to its rolling up.
The surface of the potting medium does look quite dry, so maybe the sun through the window does get a bit intense at times, though this won't be a problem during winter. Although its not wise to overwater these plants, if the soil in the pot does get a bit baked in the sun, its possible the plant is just a bit short of water.