Caladiums generally do not need any staking. I am inclined to think that it is either not getting enough light or water. You might try moving it to another position & see if you get better results.

The oldest leaves will tend to do that and can be trimmed off, however if it's the newer leaves are doing that then turtlegirl is probably right, not enough light.

PuraVida

Here in Florida, caladiums rest for the winter.
All my leaves are laying on the ground or have gone by way of the wind.
Come spring they pop back up.
You might just want to set them aside for several months......cheryl