Why won't the leaves of Monstera deliciosa “Thai Constellation” unfurl?

I've had this happen. The leaf stuck. Then, I try to use a damp towel to help add moisture and extra humidity. It works. You can do the same thing.

It could be the lack of light and water that's stopping it blooming, so why not try watering more often and giving it more light to help the leaves get the moisture they need? And another thing, if you can, give it a bit of fertilizer during spring and summer to help it grow strong.

There are lots of different reasons for this, but it's usually due to hormonal signals, cell growth, water pressure, or the temperature or light levels on your land.