Flask website Image is not reloading

So I have a website that when you put in the country you want in a form, it should graph the cases from day one for that country. However, the file is updating when I look at the image file on python-anywhere, but the actual image on the website is not updating when you put a different country in the form.

My code is at this link:

Your browser is probably caching the first image. You can use the network tab of the developer tools in your browser to see whether that is the case.