You posted an picture with little other background info, and asked, “what is wrong with my plant”. So; I made an educated guess. Kind of like giving you a haircut over the phone, LOL.
I see someone else in your area thinks it has to do with the heat. hmmm
I am legally blind, but it looks like mites in the lower piks… And the weird nature of your leaves, look like the beginning of a nasty infestation. If it is actually powdery; There may be a fungus issue.
Look up Mosaic virus, and look at the pictures of that. My memory may be off, but I seem to remember simil;ar images when looking at images of tobacco mosaic virus. Or, similar strain.
Hope you like the haircut.