Leaves against glass (help!)

I started this about a month ago, and decided to put in begonia rex cuttings. Now the leaves are growing out of the parent leaf (yay!) but against the glass (booo!). Am I screwed if I let it grow? Or should i attempt to push the leaf deeper so the roots can reach the soil and the plant can gain a straighter shape? Is this avoidable in the future, and should I stake it?