I just purchased this plant last Sunday. I repotted it and watered it the same day. Since then the leaves have begun to curl and one of the leaves is developing a large brown spot. The temperature in my apartment ranges from 72-80 degrees. What's causing this issue and how do I fix it?
It looks like shipping damage, either the plant got too cold or too hot. Remove the leaf and carry on...
Edit: could be too much sun light. You would have to wait and see as that usually develops into a dry paper thin area of the leaf. The plant looks healthy so you could wait and see or take it back for a refund.
If it is fungal/viral/bacterial you will usually see it as small spots rather than the large area of damaged tissue that you see.